powerpc: Make test_translate_branch() independent of instruction length

test_translate_branch() uses two pointers to instructions within a
buffer, p and q, to test patch_branch(). The pointer arithmetic done on
them assumes a size of 4. This will not work if the instruction length
changes. Instead do the arithmetic relative to the void * to the buffer.

Signed-off-by: Jordan Niethe <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>
Reviewed-by: Alistair Popple <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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