There is a redundant ')' at the tail of each event. So remove it.

$ sudo perf trace --no-syscalls -e 'kmem:*' -a
   899.342 kmem:kfree:(vfs_writev+0xb9) call_site=ffffffff9c453979 ptr=(nil))
   899.344 kmem:kfree:(___sys_recvmsg+0x188) call_site=ffffffff9c9b8b88 ptr=(nil))
Signed-off-by: Changbin Du <changbin.du@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1520937601-24952-1-git-send-email-changbin.du@intel.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>