freedreno/pps: Don't re-init perfcntrs

init_perfcntr() can be called multiple times.  We don't want to
regenerate the list of counters (and overwrite/leak various other
things), so just bail if we've already initialized.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/28058>

src/freedreno/ds/fd_pps_driver.cc

@@ -441,6 +441,9 @@ FreedrenoDriver::init_perfcnt()
 {
    uint64_t val;
 
+   if (dev)
+      return true;
+
    dev = fd_device_new(drm_device.fd);
    pipe = fd_pipe_new2(dev, FD_PIPE_3D, 0);
    dev_id = fd_pipe_dev_id(pipe);