NULL terminate "0"

Author: marc-mabe

ext/standard/math.c

@@ -1157,7 +1157,8 @@ PHPAPI zend_string *_php_math_number_format_long(zend_long num, int dec, const c
 			reslen = 1;
 			res = zend_string_alloc(reslen, 0);
 			t = ZSTR_VAL(res);
-			*t = '0';
+			*t++ = '0';
+			*t = '\0';
 
 			ZSTR_LEN(res) = reslen;
 			zend_string_release_ex(tmpbuf, 0);
@@ -1238,7 +1239,7 @@ PHPAPI zend_string *_php_math_number_format_long(zend_long num, int dec, const c
 	}
 
 	if (neg) {
-		*t = '-';
+		*t-- = '-';
 	}
 
 	/* Allocate more bytes in case we have to round up to more places than initially thought