MFC r209262:

r209186:

BIO_DELETE contains range we want to delete and doesn't provide any
useful data, so there is no need to copy it to userland.

r209187:

'unit' can be negative, so use signed type for it.

Found by:	Coverity Prevent
CID:		3731

Approved by:	re (kensmith)

sys/geom/gate/g_gate.c

@@ -210,7 +210,7 @@ g_gate_start(struct bio *bp)
 }
 
 static struct g_gate_softc *
-g_gate_hold(u_int unit, const char *name)
+g_gate_hold(int unit, const char *name)
 {
 	struct g_gate_softc *sc = NULL;
 
@@ -572,8 +572,8 @@ g_gate_ioctl(struct cdev *dev, u_long cmd, caddr_t addr, int flags, struct threa
 
 		switch (bp->bio_cmd) {
 		case BIO_READ:
-			break;
 		case BIO_DELETE:
+			break;
 		case BIO_WRITE:
 			error = copyout(bp->bio_data, ggio->gctl_data,
 			    bp->bio_length);