struct pcap: Update buffer type from "void *" to "u_char *"

This change should avoid these cppcheck warnings:
pcap-hurd.c:77:18: warning: 'p->buffer' is of type 'void *'. When using
void pointers in calculations, the behaviour is undefined.
[arithOperationsOnVoidPointer]
 pkt = p->buffer + offsetof(struct net_rcv_msg, packet)
                 ^
pcap-hurd.c:78:8: warning: 'p->buffer+offsetof(struct net_rcv_msg,packet)'
is of type 'void *'. When using void pointers in calculations, the
behaviour is undefined. [arithOperationsOnVoidPointer]
       + sizeof(struct packet_header) - ETH_HLEN;
       ^
pcap-hurd.c:79:25: warning: 'p->buffer' is of type 'void *'. When using
void pointers in calculations, the behaviour is undefined.
[arithOperationsOnVoidPointer]
 memmove(pkt, p->buffer + offsetof(struct net_rcv_msg, header),
                        ^

Remove some '(u_char *)' casts accordingly.

1 files changed, 1 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index 86db3d59..08763f4f 100644
--- a/CHANGES
+++ b/CHANGES
@@ -7,6 +7,7 @@ DayOfTheWeek, Month DD, YYYY / The Tcpdump Group
       Clean up DECnet address handling.
       Finalize moving of bpf_filter.c. (GH #1166)
       Address a few compiler warnings on Haiku.
+      struct pcap: Update buffer type from "void *" to "u_char *".
     Link-layer types:
       Add LINKTYPE_ETW/DLT_ETW.
       Add LINKTYPE_NETANALYZER_NG/DLT_NETANALYZER_NG (pull request