skd: Uninitialized variable in skd_isr_completion_posted()

Someone got too agressive about removing initializations and
accidentally removed the "rc = 0;" which is required.

Fixes: c830da8c ("skd: Remove superfluous initializations from skd_isr_completion_posted()")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

drivers/block/skd_main.c

@@ -1499,7 +1499,7 @@ static int skd_isr_completion_posted(struct skd_device *skdev,
 	u8 cmp_status;
 	u8 cmp_cycle;
 	u32 cmp_bytes;
-	int rc;
+	int rc = 0;
 	int processed = 0;
 
 	lockdep_assert_held(&skdev->lock);