egl-helpers: fix possible resource leak

CID 1352419, using g_strdup_printf instead of asprintf.
Signed-off-by: NGonglei <arei.gonglei@huawei.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Message-id: 1463047028-123868-2-git-send-email-arei.gonglei@huawei.com
Signed-off-by: NGerd Hoffmann <kraxel@redhat.com>

ui/egl-helpers.c

@@ -49,18 +49,15 @@ int qemu_egl_rendernode_open(void)
             continue;
         }
 
-        r = asprintf(&p, "/dev/dri/%s", e->d_name);
-        if (r < 0) {
-            return -1;
-        }
+        p = g_strdup_printf("/dev/dri/%s", e->d_name);
 
         r = open(p, O_RDWR | O_CLOEXEC | O_NOCTTY | O_NONBLOCK);
         if (r < 0) {
-            free(p);
+            g_free(p);
             continue;
         }
         fd = r;
-        free(p);
+        g_free(p);
         break;
     }