blk-iocost: tracing: atomic64_read(&ioc->vtime_rate) is assigned an extra semicolon

Remove extra semicolon.

Link: https://lkml.kernel.org/r/[email protected]

Cc: Tejun Heo <[email protected]>
Cc: Jens Axboe <[email protected]>
Signed-off-by: Li kunyu <[email protected]>
Signed-off-by: Steven Rostedt (Google) <[email protected]>

Author: likunyur

include/trace/events/iocost.h

@@ -160,7 +160,7 @@ TRACE_EVENT(iocost_ioc_vrate_adj,
 
 	TP_fast_assign(
 		__assign_str(devname, ioc_name(ioc));
-		__entry->old_vrate = atomic64_read(&ioc->vtime_rate);;
+		__entry->old_vrate = atomic64_read(&ioc->vtime_rate);
 		__entry->new_vrate = new_vrate;
 		__entry->busy_level = ioc->busy_level;
 		__entry->read_missed_ppm = missed_ppm[READ];