Add support for new cuse(3) error code, CUSE_ERR_NO_DEVICE.

This error code is useful when emulating Linux input event
devices from userspace.

PR:			218626
Submitted by:		jan.kokemueller@gmail.com
MFC after:		1 week
Sponsored by:		Mellanox Technologies

lib/libcuse/cuse.3

@@ -25,7 +25,7 @@
 .\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 .\" SUCH DAMAGE.
 .\"
-.Dd June 6, 2014
+.Dd October 5, 2017
 .Dt CUSE 3
 .Os
 .Sh NAME
@@ -292,6 +292,7 @@ enum {
   CUSE_ERR_SIGNAL
   CUSE_ERR_OTHER
   CUSE_ERR_NOT_LOADED
+  CUSE_ERR_NO_DEVICE
 
   CUSE_POLL_NONE
   CUSE_POLL_READ

sys/fs/cuse/cuse.c

@@ -390,6 +390,8 @@ cuse_convert_error(int error)
 		return (EFAULT);
 	case CUSE_ERR_SIGNAL:
 		return (EINTR);
+	case CUSE_ERR_NO_DEVICE:
+		return (ENODEV);
 	default:
 		return (ENXIO);
 	}

sys/fs/cuse/cuse_defs.h

@@ -27,7 +27,7 @@
 #ifndef _CUSE_DEFS_H_
 #define	_CUSE_DEFS_H_
 
-#define	CUSE_VERSION		0x000122
+#define	CUSE_VERSION		0x000123
 
 #define	CUSE_ERR_NONE		0
 #define	CUSE_ERR_BUSY		-1
@@ -38,6 +38,7 @@
 #define	CUSE_ERR_SIGNAL		-6
 #define	CUSE_ERR_OTHER		-7
 #define	CUSE_ERR_NOT_LOADED	-8
+#define	CUSE_ERR_NO_DEVICE	-9
 
 #define	CUSE_POLL_NONE		0
 #define	CUSE_POLL_READ		1