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, 1 deletions

diff --git a/libc/signal/sigjmp.c b/libc/signal/sigjmp.c
index d83b49a0b..646949935 100644
--- a/libc/signal/sigjmp.c
+++ b/libc/signal/sigjmp.c
@@ -31,7 +31,7 @@ int __sigjmp_save (sigjmp_buf env, int savemask) attribute_hidden;
 int __sigjmp_save (sigjmp_buf env, int savemask)
 {
     env[0].__mask_was_saved = (savemask &&
-	    sigprocmask (SIG_BLOCK, (sigset_t *) NULL, &env[0].__saved_mask) == 0);
+	    sigprocmask (SIG_BLOCK, NULL, &env[0].__saved_mask) == 0);
 
     return 0;
 }