Convert snmpd to use imsg_get_fd().

Remove proc_forward_imsg() since this function is not used by snmpd.

OK?
-- 
:wq Claudio

Index: snmpd/proc.c
===================================================================
RCS file: /cvs/src/usr.sbin/snmpd/proc.c,v
diff -u -p -r1.29 proc.c
--- snmpd/proc.c	21 Dec 2023 12:43:31 -0000	1.29
+++ snmpd/proc.c	27 Dec 2023 11:45:49 -0000
@@ -644,7 +644,7 @@ proc_dispatch(int fd, short event, void 
 		case IMSG_CTL_PROCFD:
 			IMSG_SIZE_CHECK(&imsg, &pf);
 			memcpy(&pf, imsg.data, sizeof(pf));
-			proc_accept(ps, imsg.fd, pf.pf_procid,
+			proc_accept(ps, imsg_get_fd(&imsg), pf.pf_procid,
 			    pf.pf_instance);
 			break;
 		default:
@@ -768,14 +768,6 @@ proc_composev(struct privsep *ps, enum p
     uint16_t type, const struct iovec *iov, int iovcnt)
 {
 	return (proc_composev_imsg(ps, id, -1, type, -1, -1, iov, iovcnt));
-}
-
-int
-proc_forward_imsg(struct privsep *ps, struct imsg *imsg,
-    enum privsep_procid id, int n)
-{
-	return (proc_compose_imsg(ps, id, n, imsg->hdr.type,
-	    imsg->hdr.peerid, imsg->fd, imsg->data, IMSG_DATA_SIZE(imsg)));
 }
 
 struct imsgbuf *
Index: snmpd/snmpd.h
===================================================================
RCS file: /cvs/src/usr.sbin/snmpd/snmpd.h,v
diff -u -p -r1.116 snmpd.h
--- snmpd/snmpd.h	21 Dec 2023 13:54:05 -0000	1.116
+++ snmpd/snmpd.h	27 Dec 2023 11:45:49 -0000
@@ -506,8 +506,6 @@ int	 proc_composev_imsg(struct privsep *
 	    u_int16_t, u_int32_t, int, const struct iovec *, int);
 int	 proc_composev(struct privsep *, enum privsep_procid,
 	    uint16_t, const struct iovec *, int);
-int	 proc_forward_imsg(struct privsep *, struct imsg *,
-	    enum privsep_procid, int);
 struct imsgbuf *
 	 proc_ibuf(struct privsep *, enum privsep_procid, int);
 struct imsgev *
Index: snmpd/snmpe.c
===================================================================
RCS file: /cvs/src/usr.sbin/snmpd/snmpe.c,v
diff -u -p -r1.93 snmpe.c
--- snmpd/snmpe.c	21 Dec 2023 12:43:31 -0000	1.93
+++ snmpd/snmpe.c	27 Dec 2023 11:45:49 -0000
@@ -138,7 +138,7 @@ snmpe_dispatch_parent(int fd, struct pri
 {
 	switch (imsg->hdr.type) {
 	case IMSG_AX_FD:
-		appl_agentx_backend(imsg->fd);
+		appl_agentx_backend(imsg_get_fd(imsg));
 		return 0;
 	default:
 		return -1;