netbsd: Recognize device timeouts.

Closes #710

Signed-off-by: Chris Dickens <christopher.a.dickens@gmail.com>
diff --git a/libusb/os/netbsd_usb.c b/libusb/os/netbsd_usb.c
index 41f003f..3255cf2 100644
--- a/libusb/os/netbsd_usb.c
+++ b/libusb/os/netbsd_usb.c
@@ -467,6 +467,9 @@
 		return (LIBUSB_ERROR_NO_DEVICE);
 	case ENOMEM:
 		return (LIBUSB_ERROR_NO_MEM);
+	case EWOULDBLOCK:
+	case ETIMEDOUT:
+		return (LIBUSB_ERROR_TIMEOUT);
 	}
 
 	usbi_dbg("error: %s", strerror(err));
diff --git a/libusb/version_nano.h b/libusb/version_nano.h
index a3ee32f..d7d9bc1 100644
--- a/libusb/version_nano.h
+++ b/libusb/version_nano.h
@@ -1 +1 @@
-#define LIBUSB_NANO 11490
+#define LIBUSB_NANO 11491