checkcode.sh: Abort if no path is provided

This ensures we don't try to check all python files in '/' if the
argument to the checkcode.sh script is missed by accident.

Signed-off-by: Paul Barker <pbarker@konsulko.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

scripts/checkcode.sh

@@ -2,6 +2,11 @@
 
 ERROR=0
 
+if [ $# != 1 ]; then
+    echo "Error: Please provide a path as the argument to this script!"
+    exit 1
+fi
+
 echo "Checking with pycodestyle"
 pycodestyle --ignore=W503,W606 $1/*.py $1/*/*.py || ERROR=$(expr $ERROR + 1)