[POWERPC] spufs: Fix return value of spufs_mfc_write

This patch changes spufs_mfc_write() to return
correct size instead of 0.

Signed-off-by: Masato Noguchi <Masato.Noguchi@jp.sony.com>
Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
diff --git a/arch/powerpc/platforms/cell/spufs/file.c b/arch/powerpc/platforms/cell/spufs/file.c
index 1c1af71..e666753 100644
--- a/arch/powerpc/platforms/cell/spufs/file.c
+++ b/arch/powerpc/platforms/cell/spufs/file.c
@@ -1279,6 +1279,7 @@
 		goto out;
 
 	ctx->tagwait |= 1 << cmd.tag;
+	ret = size;
 
 out:
 	return ret;