Pull up following revision(s) (requested by kamil in ticket #871):

	external/bsd/top/dist/top.c: revision 1.10

Fix unitialized signal mask passed to sigaction(2) in top(1)

Detected with Memory Sanitizer during the integration of sanitizers with
the NetBSD basesystem.

Reported by <Yang Zheng>


(martin)

@@ -135,6 +135,7 @@
 #ifdef HAVE_SIGACTION
     struct sigaction action;
 
+    sigemptyset(&action.sa_mask);
     action.sa_handler = handler;
     action.sa_flags = 0;
     (void) sigaction(sig, &action, NULL);