libat91 doesn't compile

[Björn König]

Hello,

the compilation of libat91 fails because of a compiler warning:

emac.c: In function 'CheckForNewPacket':
emac.c:326: warning: pointer targets in passing argument 1 of
'TFTP_ACK_Data' differ in signedness

Please add a simple explicit cast to (char *).

Björn
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