Fix compile warnings.

src/server/forum_auth/md5.cpp

@@ -124,7 +124,7 @@ void MD5::update(FILE *file){
   unsigned char buffer[1024];
   int len;
 
-  while (len=fread(buffer, 1, 1024, file))
+  while ((len=fread(buffer, 1, 1024, file)))
     update(buffer, len);
 
   fclose (file);

src/server/user_handler.hpp

@@ -28,6 +28,7 @@ class user_handler {
 	// implementations
 
 	public:
+		virtual ~user_handler();
 
 		//! Adds a user.
 		//! Throws an error containing the error message if adding fails