Staging: rt2860: test off by one in RtmpAsicSendCommandToMcu()

`i' reaches 101 after the loop, so if it was 100 then it succeeded in
the last iteration. This is probably unlikely to cause problems.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>