FRV: possibly bad unsigned comparison in show_backtrace()

[Roel Kluin]

In arch/frv/kernel/traps.c, show_backtrace(), if sp is 0
then the dump does not succeed because stop was set to 0
and unaltered when we reach the unsigned comparison:

 while (tos < stop) {...}

The naming stop may on the other hand suggest that this
is desired, is it?

Roel
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