Use := in save_environment

Author: alexreinking

master/master.cfg

@@ -456,8 +456,7 @@ def save_environment(prop, allowlist):
     def extract_fn(_rc, stdout, _stderr):
         env = {}
         for line in stdout.split("\n"):
-            match = re.match("^([^=]+)=(.*)$", line.strip())
-            if match:
+            if match := re.match("^([^=]+)=(.*)$", line.strip()):
                 var = match.group(1)
                 if allow_re.fullmatch(var):
                     env[var.upper()] = match.group(2)