powerpc/signal_32: Simplify loop in PPC64 save_general_regs()

save_general_regs() which does special handling when i == PT_SOFTE.

Rewrite it to minimise the specific part, especially the __put_user()
and associated error handling is the same so make it common.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Use a regular if rather than ternary operator]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/47a38df46cae5a5a88a558a64d71f75e9c4d9950.1594125164.git.christophe.leroy@csgroup.eu

arch/powerpc/kernel/signal_32.c

@@ -102,20 +102,18 @@ static inline int save_general_regs(struct pt_regs *regs,
 		struct mcontext __user *frame)
 {
 	elf_greg_t64 *gregs = (elf_greg_t64 *)regs;
-	int i;
-	/* Force usr to alway see softe as 1 (interrupts enabled) */
-	elf_greg_t64 softe = 0x1;
+	int val, i;
 
 	WARN_ON(!FULL_REGS(regs));
 
 	for (i = 0; i <= PT_RESULT; i ++) {
-		if ( i == PT_SOFTE) {
-			if(__put_user((unsigned int)softe, &frame->mc_gregs[i]))
-				return -EFAULT;
+		/* Force usr to alway see softe as 1 (interrupts enabled) */
+		if (i == PT_SOFTE)
+			val = 1;
 		else
-				continue;
-		}
-		if (__put_user((unsigned int)gregs[i], &frame->mc_gregs[i]))
+			val = gregs[i];
+
+		if (__put_user(val, &frame->mc_gregs[i]))
 			return -EFAULT;
 	}
 	return 0;