display: remove compiler warnings

Use correct typecasts and format specifiers and resolve
compiler warnings

Change-Id: I51b12ecb78a9a496cf1f76c3d32892a203f70c43
diff --git a/libhwcomposer/hwc.cpp b/libhwcomposer/hwc.cpp
index b2466d0..bb12e76 100644
--- a/libhwcomposer/hwc.cpp
+++ b/libhwcomposer/hwc.cpp
@@ -335,9 +335,9 @@
 
     //Will be unlocked at the end of set
     ctx->mDrawLock.lock();
-    setPaddingRound(ctx,numDisplays,displays);
-    setDMAState(ctx,numDisplays,displays);
-    setNumActiveDisplays(ctx,numDisplays,displays);
+    setPaddingRound(ctx, (int)numDisplays, displays);
+    setDMAState(ctx, (int)numDisplays, displays);
+    setNumActiveDisplays(ctx, (int)numDisplays, displays);
     reset(ctx, (int)numDisplays, displays);
 
     ctx->mOverlay->configBegin();