perf c2c: Clean up some defensive gets and make asan clean

To deal with histogram code that had missing gets the c2c code had
some defensive gets. Those other issues were cleaned up by the
reference count checker, clean them up for the c2c command here.

Signed-off-by: Ian Rogers <[e-mail]>
Reviewed-by: Arnaldo Carvalho de Melo <[e-mail]>
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/builtin-c2c.c

···
 	struct c2c_stats stats = { .nr_entries = 0, };
 	struct hist_entry *he;
 	struct addr_location al;
-	struct mem_info *mi, *mi_dup;
+	struct mem_info *mi = NULL;
 	struct callchain_cursor *cursor;
 	int ret;
 
···
 		goto out;
 	}
 
-	/*
-	 * The mi object is released in hists__add_entry_ops,
-	 * if it gets sorted out into existing data, so we need
-	 * to take the copy now.
-	 */
-	mi_dup = mem_info__get(mi);
-
 	c2c_decode_stats(&stats, mi);
 
 	he = hists__add_entry_ops(&c2c_hists->hists, &c2c_entry_ops,
 				  &al, NULL, NULL, mi, NULL,
 				  sample, true);
-	if (he == NULL)
-		goto free_mi;
+	if (he == NULL) {
+		ret = -ENOMEM;
+		goto out;
+	}
 
 	c2c_he = container_of(he, struct c2c_hist_entry, he);
 	c2c_add_stats(&c2c_he->stats, &stats);
···
 		int cpu = sample->cpu == (unsigned int) -1 ? 0 : sample->cpu;
 		int node = c2c.cpu2node[cpu];
 
-		mi = mi_dup;
-
 		c2c_hists = he__get_c2c_hists(he, c2c.cl_sort, 2, machine->env);
-		if (!c2c_hists)
-			goto free_mi;
+		if (!c2c_hists) {
+			ret = -ENOMEM;
+			goto out;
+		}
 
 		he = hists__add_entry_ops(&c2c_hists->hists, &c2c_entry_ops,
 					  &al, NULL, NULL, mi, NULL,
 					  sample, true);
-		if (he == NULL)
-			goto free_mi;
+		if (he == NULL) {
+			ret = -ENOMEM;
+			goto out;
+		}
 
 		c2c_he = container_of(he, struct c2c_hist_entry, he);
 		c2c_add_stats(&c2c_he->stats, &stats);
···
 	}
 
 out:
+	mem_info__put(mi);
 	addr_location__exit(&al);
 	return ret;
-
-free_mi:
-	mem_info__put(mi_dup);
-	mem_info__put(mi);
-	ret = -ENOMEM;
-	goto out;
 }
 
 static const char * const c2c_usage[] = {