os: fix memory and fd leaks in Popen

Signed-off-by: Tiago Vignatti <tiago.vignatti@nokia.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Nicolas Peninguy <nico@lostgeeks.org>

os/utils.c

@@ -1315,6 +1315,9 @@ Popen(char *command, char *type)
     /* Ignore the smart scheduler while this is going on */
     old_alarm = OsSignal(SIGALRM, SIG_IGN);
     if (old_alarm == SIG_ERR) {
+      close(pdes[0]);
+      close(pdes[1]);
+      free(cur);
       perror("signal");
       return NULL;
     }