powerpc/module_64: Improve restore_r2() return semantics
restore_r2() returns 1 on success, which is surprising for a non-boolean
function. Change it to return 0 on success and -errno on error to match
kernel coding convention.
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Acked-by: Song Liu <song@kernel.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/15baf76c271a0ae09f7b8556e50f2b4251e7049d.1674617130.git.jpoimboe@kernel.org
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