Jaegeuk Kim 4aa69d5667 f2fs: return early when trying to read null nid
If get_node_page() gets zero nid, we can return early without getting a wrong
page. For example, get_dnode_of_data() can try to do that.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
2015-12-30 10:14:12 -08:00
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