arm64: signal: Remove unnecessary check when saving POE state

The POE frame record is allocated unconditionally if POE is
supported. If the allocation fails, a SIGSEGV is delivered before
setup_sigframe() can be reached. As a result there is no need to
consider poe_offset before saving POR_EL0; just remove that check.
This is in line with other frame records (FPMR, TPIDR2).

Reviewed-by: Mark Brown <[email protected]>
Reviewed-by: Dave Martin <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Signed-off-by: Kevin Brodsky <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

Author: kevin-brodsky-arm

arch/arm64/kernel/signal.c

@@ -1154,7 +1154,7 @@ static int setup_sigframe(struct rt_sigframe_user_layout *user,
 		err |= preserve_fpmr_context(fpmr_ctx);
 	}
 
-	if (system_supports_poe() && err == 0 && user->poe_offset) {
+	if (system_supports_poe() && err == 0) {
 		struct poe_context __user *poe_ctx =
 			apply_user_offset(user, user->poe_offset);