Move sa declaration to top and initialize it in zero

Signed-off-by: Joel Pelaez Jorge <joel.pelaez.jorge@gmail.com>

Author: joelpelaez

bubblewrap.c

@@ -2889,6 +2889,7 @@ main (int    argc,
   int intermediate_pids_sockets[2] = {-1, -1};
   const char *exec_path = NULL;
   int i;
+  struct sigaction sa = {};
 
   /* Handle --version early on before we try to acquire/drop
    * any capabilities so it works in a build environment;
@@ -2900,7 +2901,6 @@ main (int    argc,
 
   /* Reset SIGCHILD to SIG_DFL allowing signalfd working propertly
    * if the parent process had set SIGCHLD to SIG_IGN. */
-  struct sigaction sa;
   sigemptyset (&sa.sa_mask);
   sa.sa_handler = SIG_DFL;
   sigaction (SIGCHLD, &sa, NULL);