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allow recovery from transmission lockups which occur in the middle of the descriptor list, rather than just at the beginning. For some unknown reason, Rhine II chips have a tendency to stop transmitting while under heavy load, possibly due to collisions. Whether this behavior is due to a hardware bug or a driver glitch is unknown as of now. In either case, this change allows the driver to gracefully recover from such situations. Special thanks go to The Anarcat <anarcat@anarcat.dyndns.org>, who bugged me into looking at this and to Dominic Marks <dominic_marks@btinternet.com>, who performed a great deal of testing to help characterize this problem. MFC after: 3 days
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