This pull request contains several UBIFS fixes. One of them fixes a race

condition between the mmap page fault path and fsync. Another just removes a
bogus assertion from the UBIFS memory shrinker.

UBIFS also started honoring the MS_SILENT mount flag, so now it won't print
many I/O errors when user-space just tries to probe for the FS.

Rest of the changes are rather minor UBI/UBIFS fixes, improvements, and
clean-ups.
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