drm_hwcomposer: Fix case on DrmCrtc mode_valid_ member variable

Change-Id: If2a431a4a18ea7908654a4a92a4a6acca8ed92d1
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmcrtc.cpp b/drmcrtc.cpp
index a7b17c4..91d5fd6 100644
--- a/drmcrtc.cpp
+++ b/drmcrtc.cpp
@@ -32,7 +32,7 @@
       width_(c->width),
       height_(c->height),
       mode_(&c->mode),
-      modeValid_(c->mode_valid) {
+      mode_valid_(c->mode_valid) {
 }
 
 DrmCrtc::~DrmCrtc() {