*: merge some common strings

   text   data    bss    dec    hexfilename
 838650   8009      0 846659  ceb43busybox_old
 838519   8009      0 846528  ceac0busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/procps/kill.c b/procps/kill.c
index e418046..1d343ed 100644
--- a/procps/kill.c
+++ b/procps/kill.c
@@ -195,7 +195,7 @@
 						continue;
 					errors++;
 					if (!quiet)
-						bb_perror_msg("can't kill pid %u", (unsigned)*pl);
+						bb_perror_msg("can't kill pid %d", (int)*pl);
 				}
 			}
 			free(pidList);