perf probe: Fix multiple --vars options behavior

Fix a bug that perf-probe fails to initialize libdwfl and shows incorrect error
when user gives multiple --vars options.

Cc: 2nddept-manager@sdl.hitachi.co.jp
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Lin Ming <ming.m.lin@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <20110330092553.2132.42691.stgit@ltc236.sdl.hitachi.co.jp>
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/probe-event.c

@@ -510,18 +510,18 @@ int show_available_vars(struct perf_probe_event *pevs, int npevs,
 	if (ret < 0)
 		return ret;
 
+	setup_pager();
+
+	for (i = 0; i < npevs && ret >= 0; i++) {
 		fd = open_vmlinux(module);
 		if (fd < 0) {
 			pr_warning("Failed to open debug information file.\n");
-		return fd;
+			ret = fd;
+			break;
 		}
-
-	setup_pager();
-
-	for (i = 0; i < npevs && ret >= 0; i++)
 		ret = show_available_vars_at(fd, &pevs[i], max_vls, _filter,
 					     externs);
-
+	}
 	return ret;
 }