Fix deallocation in encoder row-mt

While switching between row-mt and tile-mt at frame level,
in case the last frame is being encoded with tile-mt, the
memory allocated for row-mt use case should also be freed.

Change-Id: I6b18f86a3116063192fa8cf7931dbd878204b594

av1/encoder/encoder.c

diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index 9cfcd58..2896519 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -3089,7 +3089,7 @@
     aom_get_worker_interface()->end(worker);
 
     // Deallocate allocated thread data.
-    if (cpi->row_mt == 1) aom_free(thread_data->td->tctx);
+    aom_free(thread_data->td->tctx);
     if (t > 0) {
       aom_free(thread_data->td->palette_buffer);
       aom_free(thread_data->td->tmp_conv_dst);
@@ -3114,11 +3114,9 @@
     }
   }
 #if CONFIG_MULTITHREAD
-  if (cpi->row_mt == 1) {
-    if (cpi->row_mt_mutex_ != NULL) {
-      pthread_mutex_destroy(cpi->row_mt_mutex_);
-      aom_free(cpi->row_mt_mutex_);
-    }
+  if (cpi->row_mt_mutex_ != NULL) {
+    pthread_mutex_destroy(cpi->row_mt_mutex_);
+    aom_free(cpi->row_mt_mutex_);
   }
 #endif
   av1_row_mt_mem_dealloc(cpi);