Staging: line6: Fix Sparse Warning of incorrect type

This patch fixes the following sparse warnings in toneport.c-

drivers/staging/line6/toneport.c:329:48: warning: incorrect type in argument 1 (different base types)
drivers/staging/line6/toneport.c:329:48:    expected short [signed] product
drivers/staging/line6/toneport.c:329:48:    got restricted __le16 [usertype] idProduct
drivers/staging/line6/toneport.c:385:48: warning: incorrect type in argument 1 (different base types)
drivers/staging/line6/toneport.c:385:48:    expected short [signed] product
drivers/staging/line6/toneport.c:385:48:    got restricted __le16 [usertype] idProduct
drivers/staging/line6/toneport.c:438:64: warning: incorrect type in argument 1 (different base types)
drivers/staging/line6/toneport.c:438:64:    expected short [signed] product
drivers/staging/line6/toneport.c:438:64:    got restricted __le16 [usertype] idProduct

Signed-off-by: Rashika Kheria <rashika.kheria@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>