ata: libata-sff: Fix compilation warning in ata_sff_lost_interrupt()

When returning false, ata_sff_altstatus() does not return any status
value, resulting in a compilation warning in ata_sff_lost_interrupt()
("uninitialized symbol 'status'"). Fix this by initializing the local
variable "status" to 0.

Fixes: 03c0e84f9c1e ("ata: libata-sff: refactor ata_sff_altstatus()")
Cc: [e-mail]
Signed-off-by: Damien Le Moal <[e-mail]>

drivers/ata/libata-sff.c

···
 
 void ata_sff_lost_interrupt(struct ata_port *ap)
 {
-	u8 status;
+	u8 status = 0;
 	struct ata_queued_cmd *qc;
 
 	/* Only one outstanding command per SFF channel */