avrc_copy_packet: Zero initialize packet

Bug: 174149901
Change-Id: Iefa41749ebbacd34afaa24131de7ee25d706e23f
Tag: Security
Test: POC
(cherry picked from commit 960c3f3c9a1f912544b92b7a744e22069a0bc27e)
(cherry picked from commit 0f447e4fffc45b10d29e1cfcc2eb66067abaf034)

diff --git a/stack/avrc/avrc_api.cc b/stack/avrc/avrc_api.cc
index 6ad7e4f..1ac856a 100644
--- a/stack/avrc/avrc_api.cc
+++ b/stack/avrc/avrc_api.cc

@@ -237,7 +237,7 @@
 static BT_HDR* avrc_copy_packet(BT_HDR* p_pkt, int rsp_pkt_len) {
   const int offset = MAX(AVCT_MSG_OFFSET, p_pkt->offset);
   const int pkt_len = MAX(rsp_pkt_len, p_pkt->len);
-  BT_HDR* p_pkt_copy = (BT_HDR*)osi_malloc(BT_HDR_SIZE + offset + pkt_len);
+  BT_HDR* p_pkt_copy = (BT_HDR*)osi_calloc(BT_HDR_SIZE + offset + pkt_len);
 
   /* Copy the packet header, set the new offset, and copy the payload */
   memcpy(p_pkt_copy, p_pkt, BT_HDR_SIZE);