drm_hwcomposer: Change return type of DrmProperty::value() to tuple

To keep consistent with other functions

Change-Id: I11ba07eabcee08f3db09b3a5422bc480482a62c1
Signed-off-by: Sean Paul <seanpaul@chromium.org>
diff --git a/drmplane.cpp b/drmplane.cpp
index 35f91b4..6f1bf9b 100644
--- a/drmplane.cpp
+++ b/drmplane.cpp
@@ -42,7 +42,7 @@
   }
 
   uint64_t type;
-  ret = p.value(&type);
+  std::tie(ret, type) = p.value();
   if (ret) {
     ALOGE("Failed to get plane type property value");
     return ret;