powerpc: Convert BUG() to use unreachable()
Use the new unreachable() macro instead of for(;;); Signed-off-by: NDavid Daney <ddaney@caviumnetworks.com> CC: Benjamin Herrenschmidt <benh@kernel.crashing.org> CC: Paul Mackerras <paulus@samba.org> CC: linuxppc-dev@ozlabs.org Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org>
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