Add indication of whether a job got killed

We have 'X' for exited with error, add 'K' for killed by
signal as well.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/eta.c b/eta.c
index 4ad6762..7e837ba 100644
--- a/eta.c
+++ b/eta.c
@@ -20,6 +20,8 @@
 	case TD_REAPED:
 		if (td->error)
 			c = 'X';
+		else if (td->sig)
+			c = 'K';
 		else
 			c = '_';
 		break;