Rework check to avoid changing existing logic.

Author: kareem-wolfssl

src/internal.c

@@ -13285,7 +13285,7 @@ int MatchDomainName(const char* pattern, int patternLen, const char* str,
         return 1;
 #endif
 
-    while (patternLen > 0 && strLen > 0) {
+    while (patternLen > 0) {
         /* Get the next pattern char to evaluate */
         char p = (char)XTOLOWER((unsigned char)*pattern);
         if (p == '\0')
@@ -13356,6 +13356,9 @@ int MatchDomainName(const char* pattern, int patternLen, const char* str,
                 wildcardEligible = 0;
             }
 
+            if (strLen == 0)
+                return 0;
+
             /* Simple case, pattern match exactly */
             if (p != (char)XTOLOWER((unsigned char) *str))
                 return 0;