perf tools: Remove misplaced __maybe_unused

All over the tree.

Cc: David Ahern <dsahern@gmail.com>
cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/n/tip-8nzhnokxyp8y4v7gf0j00oyb@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
index 290b3cb..31c4641 100644
--- a/tools/perf/util/hist.c
+++ b/tools/perf/util/hist.c
@@ -670,7 +670,7 @@
 }
 
 static int
-iter_add_single_branch_entry(struct hist_entry_iter *iter __maybe_unused,
+iter_add_single_branch_entry(struct hist_entry_iter *iter,
 			     struct addr_location *al __maybe_unused)
 {
 	/* to avoid calling callback function */