Merge pull request #449 from jakecast/master

- bugfix for error: ISO C90 forbids mixed declarations and code in libev...

gevent/libev.h

@@ -16,10 +16,12 @@ static int sigchld_state = 0;
 
 static struct ev_loop* gevent_ev_default_loop(unsigned int flags)
 {
-    if (sigchld_state)
-        return ev_default_loop(flags);
     struct ev_loop* result;
     struct sigaction tmp;
+
+    if (sigchld_state)
+        return ev_default_loop(flags);
+
     sigaction(SIGCHLD, NULL, &tmp);
     result = ev_default_loop(flags);
     // XXX what if SIGCHLD received there?