perf symbols: Remove symbol_filter_t machinery

We're not using it anymore, few users were, but we really could do
without it, simplify lots of functions by removing it.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Wang Nan <wangnan0@huawei.com>
Link: http://lkml.kernel.org/n/tip-1zng8wdznn00iiz08bb7q3vn@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/event.c b/tools/perf/util/event.c
index 2f91183..9ad7d32 100644
--- a/tools/perf/util/event.c
+++ b/tools/perf/util/event.c
@@ -1286,7 +1286,7 @@
 		 * must be done prior to using kernel maps.
 		 */
 		if (load_map)
-			map__load(al->map, NULL);
+			map__load(al->map);
 		al->addr = al->map->map_ip(al->map, al->addr);
 	}
 }
@@ -1297,7 +1297,7 @@
 {
 	thread__find_addr_map(thread, cpumode, type, addr, al);
 	if (al->map != NULL)
-		al->sym = map__find_symbol(al->map, al->addr, NULL);
+		al->sym = map__find_symbol(al->map, al->addr);
 	else
 		al->sym = NULL;
 }
@@ -1358,7 +1358,7 @@
 			al->filtered |= (1 << HIST_FILTER__DSO);
 		}
 
-		al->sym = map__find_symbol(al->map, al->addr, NULL);
+		al->sym = map__find_symbol(al->map, al->addr);
 	}
 
 	if (symbol_conf.sym_list &&
@@ -1414,5 +1414,5 @@
 	al->sym = NULL;
 
 	if (al->map)
-		al->sym = map__find_symbol(al->map, al->addr, NULL);
+		al->sym = map__find_symbol(al->map, al->addr);
 }