Fix issue with LinearDiskCache where only new files could be written to, Append() would fail on previously existing cache files.

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@6690 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Core/Common/Src/LinearDiskCache.h

@@ -75,7 +75,7 @@ public:
 		Close();
 
 		// try opening for reading/writing
-		m_file.open(filename, ios_base::in | ios_base::out | ios_base::binary);
+		m_file.open(filename, ios_base::in | ios_base::out | ios_base::binary | ios_base::app);
 		
 		if (m_file.is_open() && ValidateHeader())
 		{
@@ -99,6 +99,7 @@ public:
 
 				++num_entries;
 			}
+			m_file.clear();
 
 			delete[] value;
 			return num_entries;