fix signed overflow in ftok

diff --git a/src/ipc/ftok.c b/src/ipc/ftok.c
index cd6002ed18ec2743220d028f5a0ee972ccc303a7..c36b4b6003af532305ac2b461616d219f11f31b2 100644 (file)
--- a/src/ipc/ftok.c
+++ b/src/ipc/ftok.c
@@ -6,5 +6,5 @@ key_t ftok(const char *path, int id)
        struct stat st;
        if (stat(path, &st) < 0) return -1;
 
-       return ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16) | ((id & 0xff) << 24));
+       return ((st.st_ino & 0xffff) | ((st.st_dev & 0xff) << 16) | ((id & 0xffu) << 24));
 }