zap/generate.py: Add clarity wrt prefix_chip_root_dir

scripts/tools/zap/generate.py

@@ -83,22 +83,21 @@ def getDirPath(name):
 def detectZclFile(zapFile):
     print(f"Searching for zcl file from {zapFile}")
 
+    prefix_chip_root_dir = True
     path = 'src/app/zap-templates/zcl/zcl.json'
 
     data = json.load(open(zapFile))
-    prefix_chip_root_dir = True
     for package in data["package"]:
         if package["type"] != "zcl-properties":
             continue
 
-        prefix_chip_root_dir = True
+        prefix_chip_root_dir = (package["pathRelativity"] != "resolveEnvVars")
         # found the right path, try to figure out the actual path
         if package["pathRelativity"] == "relativeToZap":
             path = os.path.abspath(os.path.join(
                 os.path.dirname(zapFile), package["path"]))
         elif package["pathRelativity"] == "resolveEnvVars":
             path = os.path.expandvars(package["path"])
-            prefix_chip_root_dir = False
         else:
             path = package["path"]