char: nwflash: use get_user() in write_block()

write_block() reads the user buffer one byte at a time with __get_user()
while programming and then verifying the flash, relying on the
access_ok() done in flash_write().  Each __get_user() enables and
disables user access on its own anyway, so the separation saves nothing.

Use get_user().

This is part of getting rid of __get_user() and __put_user() entirely.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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