#200 Notify 'sender element' fields, set twice

[Lorenzo Buzzi]

In trdp_mdcom.c, at lines 3380-3381 and 3410-3411, the fields dataSize and grossSize are set twice.

I also think that it's a good opportunity to replace the tabs with spaces, at least in this function.

[Bernd Löhr]

Also, a lot of tabs have migrated into the code - at least in src-folder, all tabs should be 4 spaces...