[libpng16] Trivial editing of commentary in pngrutil.c
diff --git a/pngrutil.c b/pngrutil.c
index bb4c1df..aa5cd0c 100644
--- a/pngrutil.c
+++ b/pngrutil.c
@@ -196,7 +196,7 @@
}
/* Optionally skip data and then check the CRC. Depending on whether we
- * are reading a ancillary or critical chunk, and how the program has set
+ * are reading an ancillary or critical chunk, and how the program has set
* things up, we may calculate the CRC on the data and print a message.
* Returns '1' if there was a CRC error, '0' otherwise.
*/
@@ -282,7 +282,7 @@
/* Manage the read buffer; this simply reallocates the buffer if it is not small
* enough (or if it is not allocated). The routine returns a pointer to the
- * buffer, if an error occurs and 'warn' is set the routine returns NULL, else
+ * buffer; if an error occurs and 'warn' is set the routine returns NULL, else
* it will call png_error (via png_malloc) on failure. (warn == 2 means
* 'silent').
*/
@@ -357,11 +357,11 @@
/* Implementation note: unlike 'png_deflate_claim' this internal function
* does not take the size of the data as an argument. Some efficiency could
* be gained by using this when it is known *if* the zlib stream itself does
- * not record the number, however this is a chimera: the original writer of
- * the PNG may have selected a lower window size, and we really must follow
- * that because, for systems with with limited capabilities, we would
- * otherwise reject the applications attempts to use a smaller window size.
- * (zlib doesn't have an interface to say "this or lower"!)
+ * not record the number; however, this is an illusion: the original writer
+ * follow of the PNG may have selected a lower window size, and we really
+ * must do that because, for systems with with limited capabilities, we
+ * would otherwise reject the application's attempts to use a smaller window
+ * size (zlib doesn't have an interface to say "this or lower"!).
*
* inflateReset2 was added to zlib 1.2.4; before this the window could not be
* reset, therefore it is necessary to always allocate the maximum window
