perf parse-events: Remove unused variable 'i'

Remove the 'int i' because it is declared but not used in parse-events.y
or in the generated parse-events.c.

Signed-off-by: Luke Mujica <lukemujica@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/20190703222509.109616-1-lukemujica@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/parse-events.y

@@ -626,7 +626,6 @@ PE_TERM
 PE_NAME array '=' PE_NAME
 {
 	struct parse_events_term *term;
-	int i;
 
 	ABORT_ON(parse_events_term__str(&term, PARSE_EVENTS__TERM_TYPE_USER,
 					$1, $4, &@1, &@4));