random_seed: try other alternatives if reading /dev/random fails

git-svn-id: file:///var/local/repositories/ffmpeg/trunk@22450 9553f0bf-9b14-0410-a0b8-cfaf0461ba5b

libavutil/random_seed.c

@@ -31,8 +31,9 @@ uint32_t ff_random_get_seed(void)
     if ((fd = open("/dev/random", O_RDONLY)) == -1)
         fd = open("/dev/urandom", O_RDONLY);
     if (fd != -1){
-        read(fd, &seed, 4);
+        int err = read(fd, &seed, 4);
         close(fd);
+        if (err == 4)
         return seed;
     }
 #ifdef AV_READ_TIME