Simplify code and don't use ftw() for chgrp(1)

Fix issue with uninitialized struct stat buffer as well.

chgrp.c

@@ -1,16 +1,18 @@
 /* See LICENSE file for copyright and license details. */
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <errno.h>
+#include <grp.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include <unistd.h>
-#include <ftw.h>
-#include <errno.h>
-#include <grp.h>
-#include <sys/types.h>
 #include "util.h"
 
 static int gid;
 static int failures = 0;
+static int rflag = 0;
+static struct stat st;
 
 static void
 usage(void)
@@ -18,25 +20,21 @@ usage(void)
 	eprintf("usage: chgrp [-R] groupname file...\n");
 }
 
-static int
-chgrp(const char *path, const struct stat *st, int f)
+static void
+chgrp(const char *path)
 {
-	(void)f;
-
-	if(chown(path, st->st_uid, gid) == -1) {
+	if(chown(path, st.st_uid, gid) == -1) {
 		fprintf(stderr, "chgrp: '%s': %s\n", path, strerror(errno));
 		failures++;
 	}
-
-	return 0;
+	if (rflag)
+		recurse(path, chgrp);
 }
 
 int
 main(int argc, char **argv)
 {
-	int rflag = 0;
 	struct group *gr;
-	struct stat st;
 
 	ARGBEGIN {
 	case 'R':
@@ -45,20 +43,18 @@ main(int argc, char **argv)
 	default:
 		usage();
 	} ARGEND;
+
 	if(argc < 2)
 		usage();
 
+	errno = 0;
 	gr = getgrnam(argv[0]);
-	if(!gr)
+	if (errno)
+		eprintf("getgrnam %s:");
+	else if(!gr)
 		eprintf("chgrp: '%s': No such group\n", argv[0]);
 	gid = gr->gr_gid;
 
-	if(rflag) {
-		while(*++argv)
-			ftw(*argv, chgrp, FOPEN_MAX);
-
-		return EXIT_SUCCESS;
-	}
 	while(*++argv) {
 		if(stat(*argv, &st) == -1) {
 			fprintf(stderr, "chgrp: '%s': %s\n", *argv,
@@ -66,7 +62,7 @@ main(int argc, char **argv)
 			failures++;
 			continue;
 		}
-		chgrp(*argv, &st, 0);
+		chgrp(*argv);
 	}
 
 	return failures;