[PATCH 2/4 V2] chrt: do not try to interpret the --pid option itself as a PID

When not specifying a PID with --pid, `chrt` would report:

  chrt: invalid PID argument: '--pid'

That was silly.  After this change, `chrt --pid` will report:

  chrt: too few arguments

Signed-off-by: Benno Schulenberg <[email protected]>
---
 schedutils/chrt.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/schedutils/chrt.c b/schedutils/chrt.c
index 415a9aa77..a72c0de26 100644
--- a/schedutils/chrt.c
+++ b/schedutils/chrt.c
@@ -474,6 +474,8 @@ int main(int argc, char **argv)
 			policy_given = true;
 			break;
 		case 'p':
+			if (argc - optind == 0)
+				errx(EXIT_FAILURE, _("too few arguments"));
 			errno = 0;
 			/* strtopid_or_err() is not suitable here; 0 can be passed.*/
 			ctl->pid = strtos32_or_err(argv[argc - 1], _("invalid PID argument"));
-- 
2.48.1