ptp: ocp: Apply standard pattern for cleaning up loop

The while (i--) is a standard pattern for the cleaning up loops.
Apply this pattern where it makes sense in the driver.

Reviewed-by: Vadim Fedorenko <[e-mail]>
Signed-off-by: Andy Shevchenko <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

drivers/ptp/ptp_ocp.c

···
 
 	return 0;
 out_dpll:
-	while (i) {
-		--i;
+	while (i--) {
 		dpll_pin_unregister(bp->dpll, bp->sma[i].dpll_pin, &dpll_pins_ops, &bp->sma[i]);
 		dpll_pin_put(bp->sma[i].dpll_pin);
 	}