common/rc: skip workqueue cpumask warning

Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
diff --git a/common/rc b/common/rc
index e2d3d72..faf54ef 100644
--- a/common/rc
+++ b/common/rc
@@ -4185,7 +4185,8 @@
 _check_dmesg_filter()
 {
 	egrep -v -e "BUG: MAX_LOCKDEP_CHAIN_HLOCKS too low" \
-		-e "BUG: MAX_STACK_TRACE_ENTRIES too low"
+		-e "BUG: MAX_STACK_TRACE_ENTRIES too low" \
+		 -e "WARNING: workqueue cpumask:"
 }
 
 # check dmesg log for WARNING/Oops/etc.