target-ppc: fix nego and subf*o instructions
The overflow computation of nego and subf*o instructions has been broken in commit ffe30937. Contrary to other targets, the instruction is subtract from an not subtract on PowerPC. This patch fixes the issue by using the correct argument in the xor computation. Thanks to Peter Maydell for the hint. With this change the PPC emulation passes the Gwenole Beauchesne testsuite again. Signed-off-by: NAurelien Jarno <aurelien@aurel32.net> Reviewed-by: NRichard Henderson <rth@twiddle.net> Signed-off-by: NAlexander Graf <agraf@suse.de>
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