Fixed some VS warnings

Thanks to Fraggy again !


Former-commit-id: bd0eea66714701b065892d8b69d576e7b3615dd2

src/Nazara/Core/File.cpp

@@ -237,7 +237,7 @@ std::size_t NzFile::Read(void* buffer, std::size_t size)
 
 		m_impl->SetCursorPos(NzFile::AtCurrent, size);
 
-		return m_impl->GetCursorPos()-currentPos;
+		return static_cast<std::size_t>(m_impl->GetCursorPos()-currentPos);
 	}
 }
 

src/Nazara/Core/Hash/MD5.cpp

@@ -136,7 +136,7 @@ namespace
 		 * On little-endian machines, we can process properly aligned
 		 * data without copying it.
 		 */
-		if (!(data - static_cast<const nzUInt8*>(nullptr)) & 3)
+		if (!((data - static_cast<const nzUInt8*>(nullptr)) & 3))
 		{
 			/* data are properly aligned */
 			X = reinterpret_cast<const nzUInt32*>(data);

src/Nazara/Core/Thread.cpp

@@ -135,7 +135,7 @@ bool operator>=(const NzThread::Id& lhs, const NzThread::Id& rhs)
 	return lhs.m_id >= rhs.m_id;
 }
 
-bool operator<<(std::ostream& o, const NzThread::Id& id)
+std::ostream& operator<<(std::ostream& o, const NzThread::Id& id)
 {
 	o << id.m_id;
 	return o;