Remove unused variable err in mb_send_mail() (#11285)

Author: ndossche

ext/mbstring/mbstring.c

@@ -4211,7 +4211,6 @@ PHP_FUNCTION(mb_send_mail)
 						*head_enc,	/* header transfer encoding */
 						*body_enc;	/* body transfer encoding */
 	const mbfl_language *lang;
-	int err = 0;
 	HashTable ht_headers;
 	zval *s;
 
@@ -4426,7 +4425,7 @@ PHP_FUNCTION(mb_send_mail)
 		extra_cmd = php_escape_shell_cmd(ZSTR_VAL(extra_cmd));
 	}
 
-	RETVAL_BOOL(!err && php_mail(to_r, ZSTR_VAL(subject), message, ZSTR_VAL(str_headers), extra_cmd ? ZSTR_VAL(extra_cmd) : NULL));
+	RETVAL_BOOL(php_mail(to_r, ZSTR_VAL(subject), message, ZSTR_VAL(str_headers), extra_cmd ? ZSTR_VAL(extra_cmd) : NULL));
 
 	if (extra_cmd) {
 		zend_string_release_ex(extra_cmd, 0);