Give helper function a better name

Author: nielsdos

ext/mysqlnd/mysqlnd_charset.c

@@ -769,7 +769,7 @@ PHPAPI const MYSQLND_CHARSET * mysqlnd_find_charset_name(const char * const name
 }
 /* }}} */
 
-static zend_always_inline bool mysqlnd_validity_prerequisites_check(const MYSQLND_CHARSET * const cset, const zend_uchar *str)
+static zend_always_inline bool mysqlnd_mb_validity_prerequisites_check(const MYSQLND_CHARSET * const cset, const zend_uchar *str)
 {
 	/* Encodings that have a minimum length of 1 are compatible with ASCII.
 	 * So we can skip (for performance reasons) the check to mb_valid for them. */
@@ -790,7 +790,7 @@ PHPAPI zend_ulong mysqlnd_cset_escape_quotes(const MYSQLND_CHARSET * const cset,
 		unsigned int len = 0;
 		/* check unicode characters */
 
-		if (mysqlnd_validity_prerequisites_check(cset, (const zend_uchar *) escapestr) && (len = cset->mb_valid(escapestr, end))) {
+		if (mysqlnd_mb_validity_prerequisites_check(cset, (const zend_uchar *) escapestr) && (len = cset->mb_valid(escapestr, end))) {
 			ZEND_ASSERT(newstr + len <= newstr_e);
 			/* copy mb char without escaping it */
 			while (len--) {
@@ -830,7 +830,7 @@ PHPAPI zend_ulong mysqlnd_cset_escape_slashes(const MYSQLND_CHARSET * const cset
 		char esc = '\0';
 
 		/* check unicode characters */
-		if (mysqlnd_validity_prerequisites_check(cset, (const zend_uchar *) escapestr)) {
+		if (mysqlnd_mb_validity_prerequisites_check(cset, (const zend_uchar *) escapestr)) {
 			unsigned int len = cset->mb_valid(escapestr, end);
 			if (len) {
 				ZEND_ASSERT(newstr + len <= newstr_e);