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vp9_decoder: free postproc_state.prev_mip

this fixes a leak when using MFQE

BUG=webm:1692

Change-Id: I19fb2f07155769f59924e0843989b3d3f8899bf6

--- a/vp9/decoder/vp9_decoder.c

+++ b/vp9/decoder/vp9_decoder.c

@@ -153,6 +153,11 @@

 }

 static void vp9_dec_free_mi(VP9_COMMON *cm) {

+#if CONFIG_VP9_POSTPROC

+  // MFQE allocates an additional mip and swaps it with cm->mip.

+  vpx_free(cm->postproc_state.prev_mip);

+  cm->postproc_state.prev_mip = NULL;

+#endif

   vpx_free(cm->mip);

   cm->mip = NULL;

   vpx_free(cm->mi_grid_base);