Change all pj_memset to pj_bzero(), where applicable

git-svn-id: https://svn.pjsip.org/repos/pjproject/trunk@582 74dad513-b988-da41-8d7b-12977e46ad98
diff --git a/pjlib/src/pj/pool_caching.c b/pjlib/src/pj/pool_caching.c
index 1c9f3e2..1aed730 100644
--- a/pjlib/src/pj/pool_caching.c
+++ b/pjlib/src/pj/pool_caching.c
@@ -47,7 +47,7 @@
 
     PJ_CHECK_STACK();
 
-    pj_memset(cp, 0, sizeof(*cp));
+    pj_bzero(cp, sizeof(*cp));
     
     cp->max_capacity = max_capacity;
     pj_list_init(&cp->used_list);