GH-15824: Remove check necessary

Author: youkidearitai

ext/mbstring/libmbfl/mbfl/mbfl_encoding.c

@@ -332,10 +332,6 @@ const mbfl_encoding *mbfl_name2encoding_ex(const char *name, size_t name_len)
 	}
 #endif
 
-	if (name_len == 0) {
-		return NULL;
-	}
-
 	/* Use perfect hash lookup for name */
 	if (name_len <= NAME_HASH_MAX_NAME_LENGTH && name_len >= NAME_HASH_MIN_NAME_LENGTH) {
 		unsigned int key = mbfl_name2encoding_perfect_hash(name, name_len);