perf build-id: Print debuginfod queries if -v option is used

When ending a 'perf record' session, the querying of a debuginfod server
can take quite some time. Inform a user about it when -v options is
used.
Signed-off-by: NMartin Liška <mliska@suse.cz>
Link: http://lore.kernel.org/lkml/325871cf-b71f-6237-8793-82182272ece8@suse.czSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/build-id.c

@@ -653,7 +653,11 @@ static char *build_id_cache__find_debug(const char *sbuild_id,
 
 #ifdef HAVE_DEBUGINFOD_SUPPORT
 	if (realname == NULL) {
-		debuginfod_client* c = debuginfod_begin();
+		debuginfod_client* c;
+
+		pr_debug("Downloading debug info with build id %s\n", sbuild_id);
+
+		c = debuginfod_begin();
 		if (c != NULL) {
 			int fd = debuginfod_find_debuginfo(c,
 					(const unsigned char*)sbuild_id, 0,