Fixed build error on Linux

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@1236 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/src/pjlib-test/ioq_perf.c b/pjlib/src/pjlib-test/ioq_perf.c
index cb8e827..ea47603 100644
--- a/pjlib/src/pjlib-test/ioq_perf.c
+++ b/pjlib/src/pjlib-test/ioq_perf.c
@@ -332,7 +332,7 @@
     for (i=0; i<thread_cnt; ++i) {
 	struct thread_arg *arg;
 
-	arg = (thread_arg*) pj_pool_zalloc(pool, sizeof(*arg));
+	arg = (struct thread_arg*) pj_pool_zalloc(pool, sizeof(*arg));
 	arg->id = i;
 	arg->ioqueue = ioqueue;
 	arg->counter = 0;