Fix the rmdir -p a/b/c/ case, where rmdir -p a/b/c works, and rmdir c/

works.

PR:		PR 6521
Submitted by:	Rudolf Cejka <xcejka00@dcse.fee.vutbr.cz>
Reviewed by:	eivind (in brief retrograde)

bin/rmdir/rmdir.c

@@ -96,6 +96,10 @@ rm_path(path)
 {
 	char *p;
 
+	p = path + strlen(path);
+	while (--p > path && *p == '/')
+		;
+	*++p = '\0';
 	while ((p = strrchr(path, '/')) != NULL) {
 		/* Delete trailing slashes. */
 		while (--p > path && *p == '/')