hw/9pfs: Add init callback to fs driver

This call back can be used to do fs driver specific initialization.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
diff --git a/hw/9pfs/virtio-9p-local.c b/hw/9pfs/virtio-9p-local.c
index 55f62f9..61954fe 100644
--- a/hw/9pfs/virtio-9p-local.c
+++ b/hw/9pfs/virtio-9p-local.c
@@ -21,7 +21,6 @@
 #include <sys/un.h>
 #include <attr/xattr.h>
 
-
 static int local_lstat(FsContext *fs_ctx, V9fsPath *fs_path, struct stat *stbuf)
 {
     int err;
@@ -646,7 +645,13 @@
     return ret;
 }
 
+static int local_init(FsContext *ctx)
+{
+    return 0;
+}
+
 FileOperations local_ops = {
+    .init  = local_init,
     .lstat = local_lstat,
     .readlink = local_readlink,
     .close = local_close,