sas_ss_flags: Remove nested ternary if

...to make it readable.
Signed-off-by: Richard Weinberger <richard@nod.at>

include/linux/sched.h

@@ -2360,8 +2360,10 @@ static inline int on_sig_stack(unsigned long sp)
 
 static inline int sas_ss_flags(unsigned long sp)
 {
-	return (current->sas_ss_size == 0 ? SS_DISABLE
-		: on_sig_stack(sp) ? SS_ONSTACK : 0);
+	if (!current->sas_ss_size)
+		return SS_DISABLE;
+
+	return on_sig_stack(sp) ? SS_ONSTACK : 0;
 }
 
 static inline unsigned long sigsp(unsigned long sp, struct ksignal *ksig)