perf bench futex: Remove bogus backslash from comment

It obviously doesn't belong there.
Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
Cc: Davidlohr Bueso <dbueso@suse.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lore.kernel.org/lkml/20210809043301.66002-3-dave@stgolabs.netSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/bench/futex.h

@@ -31,7 +31,7 @@ struct bench_futex_parameters {
  * @val:	typically expected value of uaddr, but varies by op
  * @timeout:	typically an absolute struct timespec (except where noted
  *		otherwise). Overloaded by some ops
- * @uaddr2:	address of second futex for some ops\
+ * @uaddr2:	address of second futex for some ops
  * @val3:	varies by op
  * @opflags:	flags to be bitwise OR'd with op, such as FUTEX_PRIVATE_FLAG
  *