probe control: give warning only when initiate probe command while usb_cmd is not USB_CMD_NOOP.
probe control: give warning only when initiate probe command while usb_cmd is not USB_CMD_NOOP.

Signed-off-by: Eric, Hsu-yao Tsai <ad8e9cf61b582456bbe32d188af06658a1707686@araisrobo.com>

araisrobo/linuxcnc,araisrobo/linuxcnc,araisrobo/linuxcnc,araisrobo/linuxcnc,araisrobo/linuxcnc