hostid: improve extremely unreadable parts

*: remove checks of sigaction and sigprocmask results
 in cases where they clearly can't fail:
 sigaction(known_good_sig)
 sigprocmask(known_good_how)

    text           data     bss     dec     hex filename
-    393              4       0     397     18d libc/pwd_grp/lckpwdf.o
+    382              4       0     386     182 libc/pwd_grp/lckpwdf.o
-     56              0       0      56      38 libc/signal/sigblock.o
+     44              0       0      44      2c libc/signal/sigblock.o
-    211              0       0     211      d3 libc/signal/sigset.o
+    202              0       0     202      ca libc/signal/sigset.o
-     56              0       0      56      38 libc/signal/sigsetmask.o
+     44              0       0      44      2c libc/signal/sigsetmask.o
-    309              0       0     309     135 libc/unistd/sleep.o
+    256              0       0     256     100 libc/unistd/sleep.o

1 files changed, 1 insertions, 2 deletions

diff --git a/libc/sysdeps/linux/common/longjmp.c b/libc/sysdeps/linux/common/longjmp.c
index 672754a73..e600c7f13 100644
--- a/libc/sysdeps/linux/common/longjmp.c
+++ b/libc/sysdeps/linux/common/longjmp.c
@@ -38,8 +38,7 @@ void __libc_longjmp (sigjmp_buf env, int val)
 
   if (env[0].__mask_was_saved)
     /* Restore the saved signal mask.  */
-    (void) sigprocmask (SIG_SETMASK, &env[0].__saved_mask,
-			  (sigset_t *) NULL);
+    (void) sigprocmask (SIG_SETMASK, &env[0].__saved_mask, NULL);
 
   /* Call the machine-dependent function to restore machine state.  */
   __longjmp (env[0].__jmpbuf, val ?: 1);