fs: remove the NULL get_block case in mpage_writepages

No one calls mpage_writepages with a NULL get_block paramter, so remove
support for that case.

Signed-off-by: Christoph Hellwig <[email protected]>
Reviewed-by: Jan Kara <[email protected]>
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
1 file changed