powerpc/ptrace: Move set_return_regs_changed() before regs_set_return_{msr/ip}

regs_set_return_msr() and regs_set_return_ip() have a copy
of the code of set_return_regs_changed().

Move up set_return_regs_changed() so it can be reused by
regs_set_return_{msr/ip}
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/49f4fb051a3e1cb69f7305d5b6768aec14727c32.1624619582.git.christophe.leroy@csgroup.eu

arch/powerpc/include/asm/ptrace.h

@@ -135,26 +135,26 @@ extern unsigned long profile_pc(struct pt_regs *regs);
 long do_syscall_trace_enter(struct pt_regs *regs);
 void do_syscall_trace_leave(struct pt_regs *regs);
 
-static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
+static inline void set_return_regs_changed(void)
 {
-	regs->nip = ip;
 #ifdef CONFIG_PPC_BOOK3S_64
 	local_paca->hsrr_valid = 0;
 	local_paca->srr_valid = 0;
 #endif
 }
 
-static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
+static inline void regs_set_return_ip(struct pt_regs *regs, unsigned long ip)
 {
-	regs->msr = msr;
+	regs->nip = ip;
 #ifdef CONFIG_PPC_BOOK3S_64
 	local_paca->hsrr_valid = 0;
 	local_paca->srr_valid = 0;
 #endif
 }
 
-static inline void set_return_regs_changed(void)
+static inline void regs_set_return_msr(struct pt_regs *regs, unsigned long msr)
 {
+	regs->msr = msr;
 #ifdef CONFIG_PPC_BOOK3S_64
 	local_paca->hsrr_valid = 0;
 	local_paca->srr_valid = 0;