fuse2fs: fix fsname option in some cases

FUSE's parser allows command-line options to be specified before
or after the device/image and mount-path. This commit changes the
value of the fsname mount option to be correct even if options are
specified before the target device/image.

Signed-off-by: Nicholas Clark <nicholas.clark@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/misc/fuse2fs.c b/misc/fuse2fs.c
index 5c73895..3214be4 100644
--- a/misc/fuse2fs.c
+++ b/misc/fuse2fs.c
@@ -3845,7 +3845,7 @@
 	/* Set up default fuse parameters */
 	snprintf(extra_args, BUFSIZ, "-okernel_cache,subtype=ext4,use_ino,"
 		 "fsname=%s,attr_timeout=0" FUSE_PLATFORM_OPTS,
-		 argv[1]);
+		 fctx.device);
 	if (fctx.no_default_opts == 0)
 		fuse_opt_add_arg(&args, extra_args);