package/xenomai: update udev rules search path

The udev rules has been moved to kernel/cobalt/udev.

Fixes:
http://autobuild.buildroot.net/results/8eb/8eb4643faed523ffccd421f20c2955adfde634a6

Signed-off-by: Romain Naour <romain.naour@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/xenomai/xenomai.mk

@@ -146,7 +146,7 @@ XENOMAI_DEPENDENCIES += udev
 
 define XENOMAI_INSTALL_UDEV_RULES
 	if test -d $(TARGET_DIR)/etc/udev/rules.d ; then \
-		for f in $(@D)/ksrc/nucleus/udev/*.rules ; do \
+		for f in $(@D)/kernel/cobalt/udev/*.rules ; do \
 			cp $$f $(TARGET_DIR)/etc/udev/rules.d/ || exit 1 ; \
 		done ; \
 	fi;