mem leak fix for cpi->tplist

checks added to make sure that cpi->tplist
is freed correctly in vp8_dealloc_compressor_data
and vp8_alloc_compressor_data.

Change-Id: I66149dbbd25c958800ad94f4379d723191d9680d
diff --git a/vp8/encoder/onyx_if.c b/vp8/encoder/onyx_if.c
index e73e41e..3f787d6 100644
--- a/vp8/encoder/onyx_if.c
+++ b/vp8/encoder/onyx_if.c
@@ -262,7 +262,8 @@
 
 void vp8_dealloc_compressor_data(VP8_COMP *cpi)
 {
-    vpx_free(cpi->tplist);
+    if(cpi->tplist!=0)
+        vpx_free(cpi->tplist);
     cpi->tplist = NULL;
 
     // Delete last frame MV storage buffers
@@ -1406,6 +1407,9 @@
         cpi->mt_sync_range = 16;
 #endif
 
+    if(cpi->tplist);
+        vpx_free(cpi->tplist);
+
     CHECK_MEM_ERROR(cpi->tplist, vpx_malloc(sizeof(TOKENLIST) * cpi->common.mb_rows));
 }