tests: Disable shellcheck SC2317

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9c424b5..16bd690 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -241,7 +241,8 @@
 .PHONY: syntax-check
 syntax-check:
 # SC2009: Consider using pgrep instead of grepping ps output.
-	shellcheck -e SC2009 \
+# SC2317: (info): Command appears to be unreachable. Check usage (or ignore if invoked indirectly).
+	shellcheck -e SC2009,SC2317 \
 		$(TESTS) $(TEST_UTILS) $(filter _test_%,$(EXTRA_DIST))
 
 check: check-am check-display