tests/rlcmac: Don't check stderr output

Current stderr output is empty anyway, and not checking it allows
enavling different log levels to easily debug issues.

Change-Id: I5b12e919e08a6eeaad31a459e5a15fdee4d76a61
diff --git a/tests/testsuite.at b/tests/testsuite.at
index 8a319bd..fe87ff9 100644
--- a/tests/testsuite.at
+++ b/tests/testsuite.at
@@ -5,8 +5,7 @@
 AT_SETUP([rlcmac])
 AT_KEYWORDS([rlcmac])
 cat $abs_srcdir/rlcmac/RLCMACTest.ok > expout
-cat $abs_srcdir/rlcmac/RLCMACTest.err > experr
-AT_CHECK([$OSMO_QEMU $abs_top_builddir/tests/rlcmac/RLCMACTest], [0], [expout], [experr])
+AT_CHECK([$OSMO_QEMU $abs_top_builddir/tests/rlcmac/RLCMACTest], [0], [expout], [ignore])
 AT_CLEANUP
 
 AT_SETUP([multi_slot])