bin/protoc-go.sh: Fix shellcheck error (#4420)

Signed-off-by: Joakim Roubert <joakimr@axis.com>

.github/workflows/static_checks.yml

@@ -85,7 +85,6 @@ jobs:
         ! -name lint \
         ! -name _log.sh \
         ! -name minikube-start-hyperv.bat \
-        ! -name protoc-go.sh \
         ! -name _tag.sh \
         ! -name test-cleanup \
         ! -name test-clouds \

bin/protoc-go.sh

@@ -3,7 +3,7 @@
 set -eu
 
 gen() {
-    for f in $@; do
+    for f in "$@"; do
         bin/protoc -I proto --go_out=plugins=grpc,paths=source_relative:controller/gen "$f"
     done
 }