reservation: Remove shadowing local variable 'ret'

It was causing the return value of fence_is_signaled to be ignored, making
reservation objects signal too early.

Cc: [e-mail]
Reviewed-by: Maarten Lankhorst <[e-mail]>
Reviewed-by: Alex Deucher <[e-mail]>
Signed-off-by: Michel Dänzer <[e-mail]>
Signed-off-by: Sumit Semwal <[e-mail]>

drivers/dma-buf/reservation.c

···
 	int ret = 1;
 
 	if (!test_bit(FENCE_FLAG_SIGNALED_BIT, &lfence->flags)) {
-		int ret;
-
 		fence = fence_get_rcu(lfence);
 		if (!fence)
 			return -1;