Remove M_USE_RESERVE from the devfs cdp allocator, which is one of two

uses of M_USE_RESERVE in the kernel. This allocation is not special.

Reviewed by:	alc
Tested by:	pho
MFC after:	2 weeks

sys/fs/devfs/devfs_devs.c

@@ -121,7 +121,7 @@ devfs_alloc(int flags)
 	struct cdev *cdev;
 	struct timespec ts;
 
-	cdp = malloc(sizeof *cdp, M_CDEVP, M_USE_RESERVE | M_ZERO |
+	cdp = malloc(sizeof *cdp, M_CDEVP, M_ZERO |
 	    ((flags & MAKEDEV_NOWAIT) ? M_NOWAIT : M_WAITOK));
 	if (cdp == NULL)
 		return (NULL);