UBUNTU: [Packaging] signing should be conditional

BugLink: http://bugs.launchpad.net/bugs/1764794Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

debian/rules.d/2-binary-arch.mk

@@ -290,11 +290,13 @@ ifneq ($(skipdbg),true)
 			$(CROSS_COMPILE)objcopy \
 				--add-gnu-debuglink=$(dbgpkgdir)/usr/lib/debug/$$module \
 				$(pkgdir)/$$module; \
+			if grep -q CONFIG_MODULE_SIG=y $(builddir)/build-$*/.config; then \
 				$(builddir)/build-$*/scripts/sign-file $(MODHASHALGO) \
 					$(MODSECKEY) \
 					$(MODPUBKEY) \
 					$(pkgdir)/$$module; \
 			fi; \
+		fi; \
 	done
 	rm -f $(dbgpkgdir)/usr/lib/debug/lib/modules/$(abi_release)-$*/build
 	rm -f $(dbgpkgdir)/usr/lib/debug/lib/modules/$(abi_release)-$*/source