This is now passing. Uncomment and close out PR6281.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@192869 91177308-0d34-0410-b5e6-96231b3b80d8

test/Sema/warn-unused-function.c

@@ -12,10 +12,8 @@ int x = sizeof(f0());
 static void f3();
 extern void f3() { } // expected-warning{{unused}}
 
-// FIXME: This will trigger a warning when it should not.
-// Update once PR6281 is fixed.
-//inline static void f4();
-//void f4() { }
+inline static void f4();
+void f4() { } // expected-warning{{unused}}
 
 static void __attribute__((used)) f5() {}
 static void f6();