display: Fix warnings

Treat warnings as errors again

Change-Id: Ibd7f484d31ad420b85e82fd5183d70bf7dce4bfa
diff --git a/libhwcomposer/hwc_utils.cpp b/libhwcomposer/hwc_utils.cpp
index a11baa9..03639ee 100644
--- a/libhwcomposer/hwc_utils.cpp
+++ b/libhwcomposer/hwc_utils.cpp
@@ -2309,7 +2309,7 @@
         swap(src_w, src_h);
     }
     //src width > MAX mixer supported dim
-    if(src_w > qdutils::MDPVersion::getInstance().getMaxMixerWidth()) {
+    if(src_w > (int) qdutils::MDPVersion::getInstance().getMaxMixerWidth()) {
         return;
     }
     //Decimation necessary, cannot use BWC. H/W requirement.