[Buildroot] [git commit branch/next] utils/docker-run: fix shellcheck errors

[Arnout Vandecappelle]

commit: https://git.buildroot.net/buildroot/commit/?id=2c3466bbeeedad1cfc8fda5120d452fd786d68e4
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/next

In utils/docker-run line 10:
    --user $(id -u):$(id -g) \
           ^------^ SC2046: Quote this to prevent word splitting.
                    ^------^ SC2046: Quote this to prevent word splitting.

The suggestions from shellcheck can be applied.

Signed-off-by: Arnout Vandecappelle <arnout at mind.be>
---
 utils/docker-run | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/utils/docker-run b/utils/docker-run
index 5653764254..164e11c0e6 100755
--- a/utils/docker-run
+++ b/utils/docker-run
@@ -7,7 +7,7 @@ IMAGE=$(grep ^image: "${MAIN_DIR}/.gitlab-ci.yml" | \
         sed -e 's,^image: ,,g' | sed -e 's,\$CI_REGISTRY,registry.gitlab.com,g')
 
 exec docker run -it --rm \
-    --user $(id -u):$(id -g) \
+    --user "$(id -u):$(id -g)" \
     --mount "type=bind,src=${MAIN_DIR},dst=${MAIN_DIR}" \
     --workdir "${MAIN_DIR}" \
     "${IMAGE}" "${@}"