#1 fix faulty test for debug message in fat.c

[Anonymous]

The test was missing a SWAB32 causing the message:
'Sector number being cleaned off, too large!'
to be printed to the debug channel even when there was
no error.

I also enhanced the debug message by printing the
relevant fat offset.

submited by LongGone (lg@jrh.me.uk)

[Nobody/Anonymous]

cvs diff fat.c