hostfs: hostfs_open: Reset open flags upon each retry

...otherwise we might end up with an incorrect mode mode.

Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index 8bbceae..80ced3d 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -315,6 +315,8 @@
 	mode |= HOSTFS_I(ino)->mode;
 
 retry:
+	r = w = 0;
+
 	if (mode & FMODE_READ)
 		r = 1;
 	if (mode & FMODE_WRITE)