rtla: Fix __set_sched_attr error message

rtla's function __set_sched_attr() was borrowed from stalld, but I
forgot to update the error message to something meaningful for rtla.

Update the error message from:
boost_with_deadline failed to boost pid PID: STRERROR
to a proper one:
Failed to set sched attributes to the pid PID: STRERROR

Link: https://lkml.kernel.org/r/[e-mail]
Link: https://lore.kernel.org/r/[e-mail]/

Fixes: b1696371d865 ("rtla: Helper functions for rtla")
Signed-off-by: Daniel Bristot de Oliveira <[e-mail]>
Signed-off-by: Steven Rostedt (Google) <[e-mail]>

tools/tracing/rtla/src/utils.c

···
 
 	retval = sched_setattr(pid, attr, flags);
 	if (retval < 0) {
-		err_msg("boost_with_deadline failed to boost pid %d: %s\n",
+		err_msg("Failed to set sched attributes to the pid %d: %s\n",
 			pid, strerror(errno));
 		return 1;
 	}