error on not enough input/seat args for cmd

sway/commands/input.c

@@ -16,7 +16,10 @@ struct cmd_results *cmd_input(int argc, char **argv) {
 		return cmd_results_new(CMD_BLOCK_INPUT, NULL, NULL);
 	}
 
-	if (argc > 2) {
+	if ((error = checkarg(argc, "input", EXPECTED_AT_LEAST, 3))) {
+		return error;
+	}
+
 	int argc_new = argc-2;
 	char **argv_new = argv+2;
 
@@ -59,7 +62,4 @@ struct cmd_results *cmd_input(int argc, char **argv) {
 	}
 	current_input_config = NULL;
 	return res;
-	}
-
-	return cmd_results_new(CMD_BLOCK_INPUT, NULL, NULL);
 }

sway/commands/seat.c

@@ -16,7 +16,10 @@ struct cmd_results *cmd_seat(int argc, char **argv) {
 		return cmd_results_new(CMD_BLOCK_SEAT, NULL, NULL);
 	}
 
-	if (argc > 2) {
+	if ((error = checkarg(argc, "seat", EXPECTED_AT_LEAST, 3))) {
+		return error;
+	}
+
 	int argc_new = argc-2;
 	char **argv_new = argv+2;
 
@@ -31,7 +34,4 @@ struct cmd_results *cmd_seat(int argc, char **argv) {
 	}
 	current_seat_config = NULL;
 	return res;
-	}
-
-	return cmd_results_new(CMD_BLOCK_SEAT, NULL, NULL);
 }