Apply by doing:
	cd /usr/src
	patch -p0 < 007_sem.patch

And then rebuild your kernel.

Index: sys/kern/sysv_sem.c
===================================================================
RCS file: /cvs/src/sys/kern/sysv_sem.c,v
retrieving revision 1.32
retrieving revision 1.32.8.1
diff -u -p -r1.32 -r1.32.8.1
--- sys/kern/sysv_sem.c	15 Jul 2004 11:24:46 -0000	1.32
+++ sys/kern/sysv_sem.c	11 Aug 2006 04:08:45 -0000	1.32.8.1
@@ -423,25 +423,23 @@ sys_semget(struct proc *p, void *v, regi
 	if (key != IPC_PRIVATE) {
 		for (semid = 0, semaptr = NULL; semid < seminfo.semmni; semid++) {
 			if ((semaptr = sema[semid]) != NULL &&
-			    semaptr->sem_perm.key == key)
-				break;
-		}
-		if (semaptr != NULL) {
-			DPRINTF(("found public key\n"));
-			if ((error = ipcperm(cred, &semaptr->sem_perm,
-			    semflg & 0700)))
-				goto error;
-			if (nsems > 0 && semaptr->sem_nsems < nsems) {
-				DPRINTF(("too small\n"));
-				error = EINVAL;
-				goto error;
-			}
-			if ((semflg & IPC_CREAT) && (semflg & IPC_EXCL)) {
-				DPRINTF(("not exclusive\n"));
-				error = EEXIST;
-				goto error;
+			    semaptr->sem_perm.key == key) {
+				DPRINTF(("found public key\n"));
+				if ((error = ipcperm(cred, &semaptr->sem_perm,
+				    semflg & 0700)))
+					goto error;
+				if (nsems > 0 && semaptr->sem_nsems < nsems) {
+					DPRINTF(("too small\n"));
+					error = EINVAL;
+					goto error;
+				}
+				if ((semflg & IPC_CREAT) && (semflg & IPC_EXCL)) {
+					DPRINTF(("not exclusive\n"));
+					error = EEXIST;
+					goto error;
+				}
+				goto found;
 			}
-			goto found;
 		}
 	}