perf scripts python: Fix missing call_path_id in export-to-postgresql script

The export does not work if only branches are exported because of a
missing column in the samples table.  Fix by adding the missing
call_path_id.

Fixes: 3521f3bc9d ("perf script: Update export-to-postgresql to support callchain export")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Link: http://lkml.kernel.org/r/1501749090-20357-2-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/scripts/python/export-to-postgresql.py

@@ -340,7 +340,8 @@ if branches:
 		'to_sym_offset	bigint,'
 		'to_ip		bigint,'
 		'branch_type	integer,'
-		'in_tx		boolean)')
+		'in_tx		boolean,'
+		'call_path_id	bigint)')
 else:
 	do_query(query, 'CREATE TABLE samples ('
 		'id		bigint		NOT NULL,'