Remove decltype where unnecessary

Change-Id: I0d1b9107810a3aaac1f52517b3ff220fdf567ee3
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/actions.hpp b/actions.hpp
index c314532..380df8b 100644
--- a/actions.hpp
+++ b/actions.hpp
@@ -71,7 +71,7 @@
  *      to the requested value.
  */
 template <typename T, typename U, typename V>
-decltype(auto) setProperty(
+auto setProperty(
     const char* path, const char* iface,
     U&& member, V&& value)
 {