filterx/object-string: make sure FILTERX_STRING_STACK_INIT() works correctly even in str_len is unsigned

Some call sites have an unsigned variable passed here, which can still become
-1. So make sure we handle that one correctly as well.

Signed-off-by: Balazs Scheidler <balazs.scheidler@axoflow.com>
Signed-off-by: László Várady <laszlo.varady@anno.io>

Author: bazsi

lib/filterx/object-string.c

@@ -132,7 +132,7 @@ _string_clone(FilterXObject *s)
 static inline FilterXString *
 _string_new(const gchar *str, gssize str_len, FilterXStringTranslateFunc translate)
 {
-  if (str_len < 0)
+  if (str_len == -1)
     str_len = strlen(str);
 
   FilterXString *self = g_malloc(sizeof(FilterXString) + str_len + 1);

lib/filterx/object-string.h

@@ -95,7 +95,7 @@ void filterx_string_global_deinit(void);
   { \
     FILTERX_OBJECT_STACK_INIT(string), \
     .str = (cstr), \
-    .str_len = ((cstr_len) < 0 ? strlen(cstr) : (cstr_len)), \
+    .str_len = (((gssize) cstr_len) == -1 ? strlen(cstr) : (cstr_len)), \
   }
 
 #define FILTERX_STRING_DECLARE_ON_STACK(_name, cstr, cstr_len) \