MIPS: bitops: Avoid redundant zero-comparison for non-LLSC

The IRQ-disabling non-LLSC fallbacks for bitops on UP systems already
return a zero or one, so there's no need to perform another comparison
against zero. Move these comparisons into the LLSC paths to avoid the
redundant work.

Signed-off-by: Paul Burton <[email protected]>
Cc: [email protected]
Cc: Huacai Chen <[email protected]>
Cc: Jiaxun Yang <[email protected]>
Cc: [email protected]

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