mb_scrub() can't return false anymore

Also drop the intermediary function which was only used here

Author: Girgias

ext/mbstring/mbstring.c

@@ -4424,14 +4424,7 @@ PHP_FUNCTION(mb_chr)
 }
 /* }}} */
 
-
-static inline char* php_mb_scrub(const char* str, size_t str_len, const mbfl_encoding *enc, size_t *ret_len)
-{
-	return php_mb_convert_encoding_ex(str, str_len, enc, enc, ret_len);
-}
-
-
-/* {{{ proto string|false mb_scrub([string str[, string encoding]]) */
+/* {{{ proto string mb_scrub([string str[, string encoding]]) */
 PHP_FUNCTION(mb_scrub)
 {
 	const mbfl_encoding *enc;
@@ -4452,11 +4445,7 @@ PHP_FUNCTION(mb_scrub)
 		RETURN_THROWS();
 	}
 
-	ret = php_mb_scrub(str, str_len, enc, &ret_len);
-
-	if (ret == NULL) {
-		RETURN_FALSE;
-	}
+	ret = php_mb_convert_encoding_ex(str, str_len, enc, enc, &ret_len);
 
 	RETVAL_STRINGL(ret, ret_len);
 	efree(ret);

ext/mbstring/mbstring.stub.php

@@ -81,7 +81,7 @@ function mb_get_info(string $type = UNKNOWN): array|string|int|false {}
 
 function mb_check_encoding(array|string $var = UNKNOWN, string $encoding = UNKNOWN): bool {}
 
-function mb_scrub(string $str, string $encoding = UNKNOWN): string|false {}
+function mb_scrub(string $str, string $encoding = UNKNOWN): string {}
 
 function mb_ord(string $str, string $encoding = UNKNOWN): int|false {}
 

ext/mbstring/mbstring_arginfo.h

@@ -193,7 +193,7 @@ ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_check_encoding, 0, 0, _IS_BOO
 	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
 ZEND_END_ARG_INFO()
 
-ZEND_BEGIN_ARG_WITH_RETURN_TYPE_MASK_EX(arginfo_mb_scrub, 0, 1, MAY_BE_STRING|MAY_BE_FALSE)
+ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_mb_scrub, 0, 1, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, str, IS_STRING, 0)
 	ZEND_ARG_TYPE_INFO(0, encoding, IS_STRING, 0)
 ZEND_END_ARG_INFO()