rv: Fix addition on an uninitialized variable 'run'

rv: Fix addition on an uninitialized variable 'run'

The variable run is not initialized however it is being accumulated
by the return value from the call to ikm_run_monitor.  Fix this by
initializing run to zero at the start of the function.

Link: https://lkml.kernel.org/r/20230424094730.105313-1-colin.i.king@gmail.com
Fixes: 4bc4b131d44c ("rv: Add rv tool")

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Acked-by: Daniel Bristot de Oliveira <bristot@kernel.org>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>