package/xenomai: drop empty line at end of .hash file

Fixes the following check-package warning:

package/xenomai/xenomai.hash:3: empty line at end of file

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/xenomai/xenomai.hash

@@ -1,3 +1,2 @@
 # Locally computed;
 sha256 c373261ddb8280d9d7078cdd9cd9646dfb7d70d8cd3aa9693d9148f03990d711  xenomai-3.0.8.tar.bz2
-