fish: use compound literal to reset SIGPIPE handler

Signed-off-by: Susant Sahani <ssahani@redhat.com>

fish/man.c

@@ -41,9 +41,9 @@ run_man (const char *cmd, size_t argc, char *argv[])
   /* We have to restore SIGPIPE to the default action around the
    * external 'man' command to avoid the warning 'gzip: stdout: Broken pipe'.
    */
-  struct sigaction sa, old_sa;
-  memset (&sa, 0, sizeof sa);
-  sa.sa_handler = SIG_DFL;
+  struct sigaction sa = {
+   .sa_handler = SIG_DFL,
+  }, old_sa;
   sigaction (SIGPIPE, &sa, &old_sa);
 
   int r = system ("man 1 guestfish");