tools/accounting/procacct: fix minor errors

The logfile option was documented but not working.  Add it and optimized
the while loop.

Link: https://lkml.kernel.org/r/20241203020550.3145-1-zhangjiao2@cmss.chinamobile.com
Signed-off-by: zhang jiao <zhangjiao2@cmss.chinamobile.com>
Reviewed-by: Dr. Thomas Orgis <thomas.orgis@uni-hamburg.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

tools/accounting/procacct.c

@@ -274,12 +274,11 @@ int main(int argc, char *argv[])
 	int maskset = 0;
 	char *logfile = NULL;
 	int cfd = 0;
-	int forking = 0;
 
 	struct msgtemplate msg;
 
-	while (!forking) {
-		c = getopt(argc, argv, "m:vr:");
+	while (1) {
+		c = getopt(argc, argv, "m:vr:w:");
 		if (c < 0)
 			break;