Fixed typo

Author: jackal1-66

.github/workflows/syntax-checks.yml

@@ -98,7 +98,7 @@ jobs:
           readarray -d '' files < \
             <(find . -path ./.git -prune -false -or -type f -name '*.C' -print0)
           for cfg in "${files[@]}"; do
-            if grep -q "\$O2DPG_ROOT" "$cfg" || grep -q "\${O2DPG_ROOT}" "$cfg";; then
+            if grep -q "\$O2DPG_ROOT" "$cfg" || grep -q "\${O2DPG_ROOT}" "$cfg"; then
               error=1
               echo "Deprecated O2DPG_ROOT detected in $cfg, replace with O2DPG_MC_CONFIG_ROOT" >&2
             fi