Fixed a memory leak in the Linux implementation of VideoMode::GetDesktopMode

git-svn-id: https://sfml.svn.sourceforge.net/svnroot/sfml/branches/sfml2@1562 4e206d99-4929-0410-ac5d-dfc041789085

src/SFML/Window/Linux/VideoModeImpl.cpp

@@ -79,6 +79,9 @@ std::vector<VideoMode> VideoModeImpl::GetFullscreenModes()
                                     modes.push_back(mode);
                             }
                         }
+
+                        // Free the array of depths
+                        XFree(depths);
                     }
                 }