firmware_loader: Only call cancel when upload is active

firmware_loader: Only call cancel when upload is active

The cancel_store() function currently calls the firmware upload cancel
operation even when no upload is in progress (i.e., when progress is
FW_UPLOAD_PROG_IDLE).

Update cancel_store() to only invoke the cancel operation when an upload
is active. If the upload is idle, return -ENODEV without calling cancel.

This change improves safety and correctness by ensuring driver operations
are only called in valid states.

Signed-off-by: Kaushlendra Kumar <kaushlendra.kumar@intel.com>
Link: https://patch.msgid.link/20250925054129.2199157-1-kaushlendra.kumar@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>