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_dbg.c b/pjlib/src/pj/pool_dbg.c
index 550fcdc..0d38dcf 100644
--- a/pjlib/src/pj/pool_dbg.c
+++ b/pjlib/src/pj/pool_dbg.c
@@ -176,7 +176,7 @@
     if (!mem)
 	return NULL;
 
-    pj_memset(mem, 0, cnt*elemsz);
+    pj_bzero(mem, cnt*elemsz);
     return mem;
 }