ICU-21159 Fix memory leaks in cintltst TestUsingDefaultWarning.
diff --git a/icu4c/source/test/cintltst/cloctst.c b/icu4c/source/test/cintltst/cloctst.c
index e3385b3..b6bc201 100644
--- a/icu4c/source/test/cintltst/cloctst.c
+++ b/icu4c/source/test/cintltst/cloctst.c
@@ -6747,70 +6747,70 @@
 
 static void TestUsingDefaultWarning() {
     UChar buff[256];
-    char cbuff[256];
+    char errorOutputBuff[256];
     UErrorCode status = U_ZERO_ERROR;
     const char* language = "jJj";
     int32_t length = uloc_getDisplayLanguage(language, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("jjj")) != 0 ||
+        u_strcmp(buff, u"jjj") != 0 ||
         length != 3) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayLanguage %s return len:%d %s with status %d %s\n",
-                language, length, cbuff, status, myErrorName(status));
+                language, length, errorOutputBuff, status, myErrorName(status));
     }
 
     status = U_ZERO_ERROR;
     const char* script = "und-lALA";
     length = uloc_getDisplayScript(script, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("Lala")) != 0 ||
+        u_strcmp(buff, u"Lala") != 0 ||
         length != 4) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayScript %s return len:%d %s with status %d %s\n",
-                script, length, cbuff, status, myErrorName(status));
+                script, length, errorOutputBuff, status, myErrorName(status));
     }
 
     status = U_ZERO_ERROR;
     const char* region = "und-wt";
     length = uloc_getDisplayCountry(region, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("WT")) != 0 ||
+        u_strcmp(buff, u"WT") != 0 ||
         length != 2) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayCountry %s return len:%d %s with status %d %s\n",
-                region, length, cbuff, status, myErrorName(status));
+                region, length, errorOutputBuff, status, myErrorName(status));
     }
 
     status = U_ZERO_ERROR;
     const char* variant = "und-abcde";
     length = uloc_getDisplayVariant(variant, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("ABCDE")) != 0 ||
+        u_strcmp(buff, u"ABCDE") != 0 ||
         length != 5) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayVariant %s return len:%d %s with status %d %s\n",
-                variant, length, cbuff, status, myErrorName(status));
+                variant, length, errorOutputBuff, status, myErrorName(status));
     }
 
     status = U_ZERO_ERROR;
     const char* keyword = "postCODE";
     length = uloc_getDisplayKeyword(keyword, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("postCODE")) != 0 ||
+        u_strcmp(buff, u"postCODE") != 0 ||
         length != 8) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayKeyword %s return len:%d %s with status %d %s\n",
-                keyword, length, cbuff, status, myErrorName(status));
+                keyword, length, errorOutputBuff, status, myErrorName(status));
     }
 
     status = U_ZERO_ERROR;
     const char* keyword_value = "de_DE@postCode=fOObAR";
     length = uloc_getDisplayKeywordValue(keyword_value, keyword, "de", buff, 256, &status);
     if (status != U_USING_DEFAULT_WARNING ||
-        u_strcmp(buff, CharsToUChars("fOObAR")) != 0 ||
+        u_strcmp(buff, u"fOObAR") != 0 ||
         length != 6) {
-        u_UCharsToChars(buff, cbuff, length+1);
+        u_UCharsToChars(buff, errorOutputBuff, length+1);
         log_err("ERROR: in uloc_getDisplayKeywordValue %s %s return len:%d %s with status %d %s\n",
-                keyword_value, keyword, length, cbuff, status, myErrorName(status));
+                keyword_value, keyword, length, errorOutputBuff, status, myErrorName(status));
     }
 }