remove checks for "impossible" errors,

clarify uses of unoptimized sigXXX ops (they check signo),
use faster sigops where approproate.

    text           data     bss     dec     hex filename
-     68              0       0      68      44 libc/signal/sighold.o
+     63              0       0      63      3f libc/signal/sighold.o
-    114              0       0     114      72 libc/signal/sigintr.o
+    110              0       0     110      6e libc/signal/sigintr.o
-    113              0       0     113      71 libc/signal/sigpause.o
+    108              0       0     108      6c libc/signal/sigpause.o
-     68              0       0      68      44 libc/signal/sigrelse.o
+     63              0       0      63      3f libc/signal/sigrelse.o

1 files changed, 1 insertions, 1 deletions

diff --git a/libc/pwd_grp/lckpwdf.c b/libc/pwd_grp/lckpwdf.c
index 41987ca5d..ff98dcb76 100644
--- a/libc/pwd_grp/lckpwdf.c
+++ b/libc/pwd_grp/lckpwdf.c
@@ -123,7 +123,7 @@ lckpwdf (void)
 
   /* Now make sure the alarm signal is not blocked.  */
   __sigemptyset (&new_set);
-  sigaddset (&new_set, SIGALRM);
+  __sigaddset (&new_set, SIGALRM);
 #if 1
   sigprocmask (SIG_UNBLOCK, &new_set, &saved_set);
 #else /* never fails */