Fix golint

Signed-off-by: Erik Hollensbe <[email protected]>

Author: Erik Hollensbe

func.go

@@ -66,15 +66,15 @@ func goMRBFuncCall(s *C.mrb_state, v C.mrb_value) C.mrb_value {
 	methodTable := classTable.Map[ci.proc.target_class]
 	classTable.Mutex.Unlock()
 	if methodTable == nil {
-		panic(fmt.Sprintf("func call on unknown class"))
+		panic("func call on unknown class")
 	}
 
 	// Lookup the method
 	methodTable.Mutex.Lock()
 	f := methodTable.Map[ci.mid]
 	methodTable.Mutex.Unlock()
 	if f == nil {
-		panic(fmt.Sprintf("func call on unknown method"))
+		panic("func call on unknown method")
 	}
 
 	// Call the method to get our *Value