gs_usb: explicitly handle timeout=None separate from =0 (@zariiii9003)

Author: BenGardiner

can/interfaces/gs_usb.py

@@ -178,10 +178,13 @@ def _recv_internal(self, timeout: float | None) -> tuple[can.Message | None, boo
         """
         frame = GsUsbFrame()
 
-        # Do not set timeout as None or zero here to avoid blocking
-        timeout_ms = round(timeout * 1000) if timeout else 0
-        if not self.gs_usb.read(frame=frame, timeout_ms=timeout_ms):
-            return None, False
+        if timeout is None:
+            timeout_ms = 0
+        else:
+            # Do not set timeout as None or zero here to avoid blocking
+            timeout_ms = round(timeout * 1000) if timeout else 1
+            if not self.gs_usb.read(frame=frame, timeout_ms=timeout_ms):
+                return None, False
 
         msg = can.Message(
             timestamp=frame.timestamp,