lttng-babeltrace: fix typo in license information

Fixes:

  http://autobuild.buildroot.org/results/c22/c229130ceab6db9d8b7f373716de9ae4b15f45eb/build-end.log

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/lttng-babeltrace/lttng-babeltrace.mk

@@ -8,7 +8,7 @@ LTTNG_BABELTRACE_SITE    = http://lttng.org/files/babeltrace/
 LTTNG_BABELTRACE_VERSION = 1.2.1
 LTTNG_BABELTRACE_SOURCE  = babeltrace-$(LTTNG_BABELTRACE_VERSION).tar.bz2
 LTTNG_BABELTRACE_LICENSE = MIT; LGPL2.1 for include/babeltrace/list.h; GPLv2+ for test code
-LTTNG_BABELTRACE_LICENSE_FILES = mit-license.txt glp-2.0.txt LICENSE
+LTTNG_BABELTRACE_LICENSE_FILES = mit-license.txt gpl-2.0.txt LICENSE
 
 LTTNG_BABELTRACE_DEPENDENCIES = popt util-linux libglib2