utils: defensive programming

If caller passed the size of array not string length, it is possible to be accessed out of bounds.

Reorder conditions can prevent access invalid index of array.

Signed-off-by: 2xsec <dh48.jeong@samsung.com>

src/lxc/utils.c

@@ -891,10 +891,10 @@ static char *get_nextpath(char *path, int *offsetp, int fulllen)
 	if (offset >= fulllen)
 		return NULL;
 
-	while (path[offset] != '\0' && offset < fulllen)
+	while (offset < fulllen && path[offset] != '\0')
 		offset++;
 
-	while (path[offset] == '\0' && offset < fulllen)
+	while (offset < fulllen && path[offset] == '\0')
 		offset++;
 
 	*offsetp = offset;