make: lint a couple of shell scripts we can easily find

(cherry picked from commit 11561ba4)

Makefile

@@ -168,6 +168,8 @@ plist: force
 	@${MAKE} -C ${.CURDIR}/src plist
 
 lint: force
+	find ${.CURDIR}/src ${.CURDIR}/scripts \
+	    -name "*.sh" -type f -print0 | xargs -0 -n1 sh -n
 	find ${.CURDIR}/src ${.CURDIR}/lang/dynamic/helpers \
 	    ! -name "*.xml" ! -name "*.xml.sample" ! -name "*.eot" \
 	    ! -name "*.svg" ! -name "*.woff" ! -name "*.woff2" \

src/opnsense/scripts/firmware/check.sh

@@ -226,6 +226,4 @@ if [ "$pkg_running" == "" ]; then
       last_check=`date`
       # Write our json structure to disk
       echo "{\"connection\":\"$connection\",\"repository\":\"$repository\",\"last_check\":\"$last_check\",\"updates\":\"$updates\",\"download_size\":\"$download_size\",\"extra_space_required\":\"$required_space\",\"new_packages\":[$packages_new],\"reinstall_packages\":[$packages_reinstall],\"upgrade_packages\":[$packages_upgraded],\"upgrade_needs_reboot\":\"$upgrade_needs_reboot\"}"
-else
-  # pkg is already running, quitting
 fi