check_procs: clarify debug message

plugins/check_procs.c

@@ -238,7 +238,7 @@ main (int argc, char **argv)
 				(!usepid && ((ret = stat_exe(procpid, &statbuf) != -1) && statbuf.st_dev == mydev && statbuf.st_ino == myino) ||
 				 (ret == -1 && errno == ENOENT))) {
 				if (verbose >= 3)
-					 printf("not considering - is myself\n");
+					 printf("not considering - is myself or gone\n");
 				continue;
 			}