fix change I reverted. Oops.

stepmania/src/arch/MemoryCard/MemoryCardDriver.cpp

@@ -18,14 +18,11 @@ bool UsbStorageDevice::operator==(const UsbStorageDevice& other) const
 #undef COMPARE
 }
 
-// What is this?
-#if 0
 void UsbStorageDevice::SetOsMountDir( const CString &s )
 {
 	sOsMountDir = s;
 	FixSlashesInPlace( sOsMountDir );
 }
-#endif
 
 MemoryCardDriver *MakeMemoryCardDriver()
 {

stepmania/src/arch/MemoryCard/MemoryCardDriver.h

@@ -36,7 +36,8 @@ struct UsbStorageDevice
   CString sVendor;
   CString sProduct;
 
-	bool IsBlank() { return sOsMountDir.empty(); }
+  bool IsBlank() const { return sOsMountDir.empty(); }
+  void SetOsMountDir( const CString &s );
 
   bool operator==(const UsbStorageDevice& other) const;
 };