debugfs: fix argument parsing in do_freefrag()

When do_freefrag() is called from debugfs, the value of optind is
not reset. Rectify that by calling reset_getopt().

Signed-off-by: Artemiy Volkov <artemiyv@acm.org>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/misc/e2freefrag.c b/misc/e2freefrag.c
index bb72c70..90acb7e 100644
--- a/misc/e2freefrag.c
+++ b/misc/e2freefrag.c
@@ -277,6 +277,7 @@
 #ifdef DEBUGFS
 	if (check_fs_open(argv[0]))
 		return;
+	reset_getopt();
 #else
 	char *device_name;