blsuki: Error out if unexpected arguments are supplied

This can be especially helpful, as the Fedora version of the blscfg
actually made use of positional arguments, but current implementation
switched to parameters. For example what used to be "blscfg (hd0,gpt2)/..."
now should be "blscfg --path (hd0,gpt2)/...)". In case of old configs/scripts
still supplying positional arguments we will now error out instead of just
ignoring them and falling back to defaults silently.

Signed-off-by: Radoslav Kolev <radoslav.kolev@suse.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

Author: radolin

grub-core/commands/blsuki.c

@@ -1458,19 +1458,23 @@ blsuki_cmd (grub_extcmd_context_t ctxt, enum blsuki_cmd_type cmd_type)
 }
 
 static grub_err_t
-grub_cmd_blscfg (grub_extcmd_context_t ctxt, int argc __attribute__ ((unused)),
+grub_cmd_blscfg (grub_extcmd_context_t ctxt, int argc,
 		 char **args __attribute__ ((unused)))
 {
+  if (argc != 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("unexpected argument(s) found, see --help"));
   return blsuki_cmd (ctxt, BLSUKI_BLS_CMD);
 }
 
 static grub_extcmd_t bls_cmd;
 
 #ifdef GRUB_MACHINE_EFI
 static grub_err_t
-grub_cmd_uki (grub_extcmd_context_t ctxt, int argc __attribute__ ((unused)),
+grub_cmd_uki (grub_extcmd_context_t ctxt, int argc,
 		 char **args __attribute__ ((unused)))
 {
+  if (argc != 0)
+    return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("unexpected argument(s) found, see --help"));
   return blsuki_cmd (ctxt, BLSUKI_UKI_CMD);
 }