Remove Unused Variable to Fix Compilation Error

Change-Id: I5bd784dd9ebbd1905fb0727bf69fd2f6cbb00e36
diff --git a/sdm/libs/core/display_hdmi.cpp b/sdm/libs/core/display_hdmi.cpp
index 1f1a051..2076fe5 100644
--- a/sdm/libs/core/display_hdmi.cpp
+++ b/sdm/libs/core/display_hdmi.cpp
@@ -170,7 +170,6 @@
 uint32_t DisplayHDMI::GetBestConfig(HWS3DMode s3d_mode) {
   uint32_t best_index = 0, index;
   uint32_t num_modes = 0;
-  HWDisplayAttributes best_attrib;
 
   hw_intf_->GetNumDisplayAttributes(&num_modes);