Improved compatibility of sceUtilitySavedata MODE_FILES:
- number of entries only updated when returning no error
- number of entries only updated for non-null address pointers.
Improved compatibility of sceUtilityMsg MODE_ERROR: buttonPressed is ESC.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3290 4ab978e6-3352-0410-996c-0b42db0051c8
Improved sceMpegInit: reset all mpeg data.

git-svn-id: http://jpcsp.googlecode.com/svn/trunk@3291 4ab978e6-3352-0410-996c-0b42db0051c8