f2fs: don't need to get f2fs_lock_op for the inline_data test

This patch locates checking the inline_data prior to calling f2fs_lock_op()
in truncate_blocks(), since getting the lock is unnecessary.

Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

diff --cc fs/f2fs/file.c
Simple merge