display: Fix warnings

Treat warnings as errors again

Change-Id: Ibd7f484d31ad420b85e82fd5183d70bf7dce4bfa
diff --git a/libqdutils/mdp_version.h b/libqdutils/mdp_version.h
index dd1aa3d..d26c55c 100644
--- a/libqdutils/mdp_version.h
+++ b/libqdutils/mdp_version.h
@@ -137,7 +137,7 @@
     bool isDynFpsSupported() { return mPanelInfo.mDynFpsSupported; }
     uint32_t getMinFpsSupported() { return mPanelInfo.mMinFps; }
     uint32_t getMaxFpsSupported() { return mPanelInfo.mMaxFps; }
-    int getMaxMixerWidth() const { return mMaxMixerWidth; }
+    uint32_t getMaxMixerWidth() const { return mMaxMixerWidth; }
     bool isSrcSplit() const;
     bool isSrcSplitAlways() const;
     bool isRGBScalarSupported() const;