Fix Shellcheck SC2164: exit in case cd fails.

Use `cd ... || exit` in case cd fails.

https://github.com/koalaman/shellcheck/wiki/SC2164

Signed-off-by: Dan Callahan <danc@element.io>

scripts-dev/check_line_terminators.sh

@@ -25,7 +25,7 @@
 # terminators are found, 0 otherwise.
 
 # cd to the root of the repository
-cd `dirname $0`/..
+cd `dirname $0`/.. || exit
 
 # Find and print files with non-unix line terminators
 if find . -path './.git/*' -prune -o -type f -print0 | xargs -0 grep -I -l $'\r$'; then

scripts-dev/config-lint.sh

@@ -3,7 +3,7 @@
 # Exits with 0 if there are no problems, or another code otherwise.
 
 # cd to the root of the repository
-cd `dirname $0`/..
+cd `dirname $0`/.. || exit
 
 # Restore backup of sample config upon script exit
 trap "mv docs/sample_config.yaml.bak docs/sample_config.yaml" EXIT