scsi: BusLogic: Avoid unbounded vsprintf() use

Existing blogic_msg() invocations do not appear to overrun its internal
buffer of a fixed length of 100, which would cause stack corruption, but
it's easy to miss with possible further updates and a fix is cheap in
performance terms, so limit the output produced into the buffer by using
vscnprintf() rather than vsprintf().

Link: https://lore.kernel.org/r/[email protected]
Acked-by: Khalid Aziz <[email protected]>
Signed-off-by: Maciej W. Rozycki <[email protected]>
Signed-off-by: Martin K. Petersen <[email protected]>

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