ozone: drm: Fix memory leak in IsDrmModuleName()

We need to call drmFreeVersion().

Bug: none
Test: compile

Change-Id: I0c819d989a15dc2a5ddda7f9e37311d860f5afa1
Reviewed-on: https://chromium-review.googlesource.com/1146980Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Commit-Queue: Michael Spang <spang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577215}

ui/ozone/platform/drm/common/drm_util.cc

@@ -212,7 +212,9 @@ bool IsDrmModuleName(const int fd, const std::string& name) {
   // and tested.
   drmVersionPtr drm_version = drmGetVersion(fd);
   DCHECK(drm_version) << "Can't get version for drm device.";
-  return std::string(drm_version->name) == name;
+  bool result = std::string(drm_version->name) == name;
+  drmFreeVersion(drm_version);
+  return result;
 }
 
 bool AreDisplayModesEqual(const DisplayMode_Params& lhs,