cmd: efidebug: correct error message

Add the missing line feed at the error message if the variable referred to
by 'efidebug boot rm' does not exist.

Shorten the format string by using the variable name instead of the number
of the boot variable.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

cmd/efidebug.c

@@ -667,7 +667,7 @@ static int do_efi_boot_rm(cmd_tbl_t *cmdtp, int flag,
 
 		ret = EFI_CALL(RT->set_variable(var_name16, &guid, 0, 0, NULL));
 		if (ret) {
-			printf("Cannot remove Boot%04X", id);
+			printf("Cannot remove %ls\n", var_name16);
 			return CMD_RET_FAILURE;
 		}
 	}