bootctl: Fix update not adding EFI entry if Boot IDs are non-consecutive

"bootctl update" tries to add sd-boot to the EFI boot loader list if it
is not already there. To do so, it uses find_slot() which finds the
proper BootXXXX slot ID to use and also returns 1 if an existing sd-boot
entry was found at this ID or 0 if it is a new unused ID. In "update"
case install_variables() only writes the entry in case 0 (no existing
entry).

However, find_slot() erroneously returns 1 if it finds a gap in the Boot
IDs (i.e. when not resorting to max(ids) + 1). This causes
"bootctl update" to not add a missing systemd-boot boot entry if the
existing BootXXXX entry IDs are not consecutive.

Fix that by returning 0 in find_slot() when an empty gap ID is selected
to make it match the behavior when selecting an empty non-gap ID.

src/boot/bootctl.c

@@ -722,7 +722,7 @@ static int find_slot(sd_id128_t uuid, const char *path, uint16_t *id) {
         for (i = 0; i < n; i++)
                 if (i != options[i]) {
                         *id = i;
-                        return 1;
+                        return 0;
                 }
 
         /* use the next one */