mtd: ssfdc: Remove an unused variable

Since its introduction the driver was declaring a "usecount" variable,
but nobody ever used it upstream.

This was spot while grepping for usecount through mtd/ for other
reasons.

Signed-off-by: Miquel Raynal <[e-mail]>
Link: https://lore.kernel.org/linux-mtd/[e-mail]

drivers/mtd/ssfdc.c

···
 
 struct ssfdcr_record {
 	struct mtd_blktrans_dev mbd;
-	int usecount;
 	unsigned char heads;
 	unsigned char sectors;
 	unsigned short cylinders;