Add modernize-redundant-void-arg

Enable this check and fix the failures.

Change-Id: I89b13daf1161be40564367562bb9c8c0c459e1d0
Signed-off-by: Ed Tanous <ed@tanous.net>
diff --git a/src/NVMeContext.hpp b/src/NVMeContext.hpp
index 14e38a1..4eb81e4 100644
--- a/src/NVMeContext.hpp
+++ b/src/NVMeContext.hpp
@@ -106,4 +106,4 @@
 
 using NVMEMap = boost::container::flat_map<int, std::shared_ptr<NVMeContext>>;
 
-NVMEMap& getNVMEMap(void);
+NVMEMap& getNVMEMap();