powerpc/ptrace: Add prototype for function pt_regs_check
`pt_regs_check` is a dummy function, its purpose is to break the build if struct pt_regs and struct user_pt_regs don't match. This function has no functionnal purpose, and will get eliminated at link time or after init depending on CONFIG_LD_DEAD_CODE_DATA_ELIMINATION This commit adds a prototype to fix warning at W=1: arch/powerpc/kernel/ptrace.c:3339:13: error: no previous prototype for ‘pt_regs_check’ [-Werror=missing-prototypes] Suggested-by: Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by: Mathieu Malaterre <malat@debian.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/20181208154624.6504-1-malat@debian.org
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