Only copy current reorder into test if it is not NULL in bidi-testgen

Signed-off-by: Laslo Hunhold <dev@frign.de>

gen/bidirectional-test.c

diff --git a/gen/bidirectional-test.c b/gen/bidirectional-test.c
index 3034564..848db7b 100644
--- a/gen/bidirectional-test.c
+++ b/gen/bidirectional-test.c
@@ -333,7 +333,10 @@
 			fprintf(stderr, "calloc: %s\n", strerror(errno));
 			exit(1);
 		}
-		memcpy(test[testlen - 1].reorder, current_reorder, current_reorder_len * sizeof(*(test[testlen - 1].reorder)));
+		if (current_reorder != NULL) {
+			memcpy(test[testlen - 1].reorder, current_reorder,
+			       current_reorder_len * sizeof(*(test[testlen - 1].reorder)));
+		}
 		test[testlen - 1].reorderlen = current_reorder_len;
 	
 		if (current_level_len != test[testlen - 1].cplen) {