Silence compiler warnings

Author: nielsdos

ext/mbstring/mbstring.c

@@ -5564,16 +5564,14 @@ PHP_FUNCTION(mb_str_pad)
 	size_t num_mb_pad_chars = pad_to_length - input_length;
 
 	/* We need to figure out the left/right padding lengths. */
-	size_t left_pad, right_pad;
+	size_t left_pad = 0, right_pad = 0; /* Initialize here to silence compiler warnings. */
 	switch (pad_type_val) {
 		case PHP_STR_PAD_RIGHT:
-			left_pad = 0;
 			right_pad = num_mb_pad_chars;
 			break;
 
 		case PHP_STR_PAD_LEFT:
 			left_pad = num_mb_pad_chars;
-			right_pad = 0;
 			break;
 
 		case PHP_STR_PAD_BOTH: