kernel: return the value of ksu_sys_umount

* Potentially causing compilation error?

Signed-off-by: rsuntk <rsuntk@yukiprjkt.my.id>

kernel/core_hook.c

@@ -1180,8 +1180,10 @@ static int ksu_sys_umount(const char *mnt, int flags)
 
 #define ksu_umount_mnt(mnt, __unused, flags)		\
 	({						\
+		int ret;				\
 		path_put(__unused);			\
-		ksu_sys_umount(mnt, flags);	\
+		ret = ksu_sys_umount(mnt, flags);	\
+		ret;					\
 	})
 
 #endif