[PATCH] Fix the sign of the result of a conditional expression

In include/asm-x86_64/bitops.h, the find_{first,next,first_zero,next_zero}_bit
macros return a result type that depends on the width of the "size" argument.
The type of both arms of a conditional expression should always be the same.

I changed the return type of __scanbit() to match the return type of the
x86_64 find_*_bit() functions.

-- 
corporate:    <chuck dot lever at oracle dot com>
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  - From: Chuck Lever <[email protected]>

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