Merge branch 'upstream' of git://git.infradead.org/~dedekind/ubi-2.6
* 'upstream' of git://git.infradead.org/~dedekind/ubi-2.6: (28 commits)
UBI: fix compile warning
UBI: fix error handling in erase worker
UBI: fix comments
UBI: remove unneeded error checks
UBI: cleanup usage of try_module_get
UBI: fix overflow bug
UBI: bugfix in max_sqnum calculation
UBI: bugfix in sqnum calculation
UBI: fix signed-unsigned multiplication
UBI: fix bug in atomic_leb_change()
UBI: fix message
UBI: fix debugging stuff
UBI: bugfix in error path
UBI: use is_power_of_2()
UBI: fix freeing ubi->vtbl while unloading
UBI: fix MAINTAINERS
UBI: bugfix in ubi_leb_change()
UBI: kill homegrown endian macros
UBI: cleanup ioctl handling
UBI: error path bugfix
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