[S390] sparse: fix access past end of array warnings

Remove unnecessary code to avoid false positives from sparse, e.g.

arch/s390/kernel/compat_signal.c:221:61: warning: invalid access past the end of 'set32' (8 8)
Signed-off-by: NMartin Schwidefsky <schwidefsky@de.ibm.com>

arch/s390/kernel/compat_linux.c

@@ -362,12 +362,7 @@ asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 	if (set) {
 		if (copy_from_user (&s32, set, sizeof(compat_sigset_t)))
 			return -EFAULT;
-		switch (_NSIG_WORDS) {
-		case 4: s.sig[3] = s32.sig[6] | (((long)s32.sig[7]) << 32);
-		case 3: s.sig[2] = s32.sig[4] | (((long)s32.sig[5]) << 32);
-		case 2: s.sig[1] = s32.sig[2] | (((long)s32.sig[3]) << 32);
-		case 1: s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
-		}
+		s.sig[0] = s32.sig[0] | (((long)s32.sig[1]) << 32);
 	}
 	set_fs (KERNEL_DS);
 	ret = sys_rt_sigprocmask(how,
@@ -377,12 +372,8 @@ asmlinkage long sys32_rt_sigprocmask(int how, compat_sigset_t __user *set,
 	set_fs (old_fs);
 	if (ret) return ret;
 	if (oset) {
-		switch (_NSIG_WORDS) {
-		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
-		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
-		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
-		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
-		}
+		s32.sig[1] = (s.sig[0] >> 32);
+		s32.sig[0] = s.sig[0];
 		if (copy_to_user (oset, &s32, sizeof(compat_sigset_t)))
 			return -EFAULT;
 	}
@@ -401,12 +392,8 @@ asmlinkage long sys32_rt_sigpending(compat_sigset_t __user *set,
 	ret = sys_rt_sigpending((sigset_t __force __user *) &s, sigsetsize);
 	set_fs (old_fs);
 	if (!ret) {
-		switch (_NSIG_WORDS) {
-		case 4: s32.sig[7] = (s.sig[3] >> 32); s32.sig[6] = s.sig[3];
-		case 3: s32.sig[5] = (s.sig[2] >> 32); s32.sig[4] = s.sig[2];
-		case 2: s32.sig[3] = (s.sig[1] >> 32); s32.sig[2] = s.sig[1];
-		case 1: s32.sig[1] = (s.sig[0] >> 32); s32.sig[0] = s.sig[0];
-		}
+		s32.sig[1] = (s.sig[0] >> 32);
+		s32.sig[0] = s.sig[0];
 		if (copy_to_user (set, &s32, sizeof(compat_sigset_t)))
 			return -EFAULT;
 	}

arch/s390/kernel/compat_signal.c

@@ -213,16 +213,8 @@ sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
 		ret = get_user(sa_handler, &act->sa_handler);
 		ret |= __copy_from_user(&set32, &act->sa_mask,
 					sizeof(compat_sigset_t));
-		switch (_NSIG_WORDS) {
-		case 4: new_ka.sa.sa_mask.sig[3] = set32.sig[6]
-				| (((long)set32.sig[7]) << 32);
-		case 3: new_ka.sa.sa_mask.sig[2] = set32.sig[4]
-				| (((long)set32.sig[5]) << 32);
-		case 2: new_ka.sa.sa_mask.sig[1] = set32.sig[2]
-				| (((long)set32.sig[3]) << 32);
-		case 1: new_ka.sa.sa_mask.sig[0] = set32.sig[0]
-				| (((long)set32.sig[1]) << 32);
-		}
+		new_ka.sa.sa_mask.sig[0] =
+			set32.sig[0] | (((long)set32.sig[1]) << 32);
 		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
 		
 		if (ret)
@@ -233,20 +225,8 @@ sys32_rt_sigaction(int sig, const struct sigaction32 __user *act,
 	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
 
 	if (!ret && oact) {
-		switch (_NSIG_WORDS) {
-		case 4:
-			set32.sig[7] = (old_ka.sa.sa_mask.sig[3] >> 32);
-			set32.sig[6] = old_ka.sa.sa_mask.sig[3];
-		case 3:
-			set32.sig[5] = (old_ka.sa.sa_mask.sig[2] >> 32);
-			set32.sig[4] = old_ka.sa.sa_mask.sig[2];
-		case 2:
-			set32.sig[3] = (old_ka.sa.sa_mask.sig[1] >> 32);
-			set32.sig[2] = old_ka.sa.sa_mask.sig[1];
-		case 1:
-			set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
-			set32.sig[0] = old_ka.sa.sa_mask.sig[0];
-		}
+		set32.sig[1] = (old_ka.sa.sa_mask.sig[0] >> 32);
+		set32.sig[0] = old_ka.sa.sa_mask.sig[0];
 		ret = put_user((unsigned long)old_ka.sa.sa_handler, &oact->sa_handler);
 		ret |= __copy_to_user(&oact->sa_mask, &set32,
 				      sizeof(compat_sigset_t));