drm_hwcomposer: clang-tidy: enable clang-analyzer-* checks

+ fixed existing tidy warnings for these checks.

Signed-off-by: Roman Stratiienko <r.stratiienko@gmail.com>
diff --git a/compositor/DrmDisplayComposition.cpp b/compositor/DrmDisplayComposition.cpp
index 1e9e127..a8dc0fc 100644
--- a/compositor/DrmDisplayComposition.cpp
+++ b/compositor/DrmDisplayComposition.cpp
@@ -72,8 +72,10 @@
 }
 
 int DrmDisplayComposition::SetDisplayMode(const DrmMode &display_mode) {
-  if (!validate_composition_type(DRM_COMPOSITION_TYPE_MODESET))
+  if (!validate_composition_type(DRM_COMPOSITION_TYPE_MODESET)) {
+    ALOGE("SetDisplayMode() Failed to validate composition type");
     return -EINVAL;
+  }
   display_mode_ = display_mode;
   dpms_mode_ = DRM_MODE_DPMS_ON;
   type_ = DRM_COMPOSITION_TYPE_MODESET;