xfs: fix another missing include

Fix missing include of xfs_filestream.h in xfs_filestream.c so that we
actually check the function declarations against the definitions.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/xfs_filestream.c

@@ -18,6 +18,7 @@
 #include "xfs_trace.h"
 #include "xfs_ag_resv.h"
 #include "xfs_trans.h"
+#include "xfs_filestream.h"
 
 struct xfs_fstrm_item {
 	struct xfs_mru_cache_elem	mru;