can: mcp251xfd: mcp251xfd_chip_clock_enable(): simplify return

This patch simplifies the return of the mcp251xfd_chip_clock_enable()
function by direct returning the error.

Link: https://lore.kernel.org/r/20210128104644.2982125-8-mkl@pengutronix.deSigned-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c

@@ -596,11 +596,9 @@ static int mcp251xfd_chip_clock_enable(const struct mcp251xfd_priv *priv)
 			   "Timeout waiting for Oscillator Ready (osc=0x%08x, osc_reference=0x%08x)\n",
 			   osc, osc_reference);
 		return -ETIMEDOUT;
-	} else if (err) {
-		return err;
 	}
 
-	return 0;
+	return err;
 }
 
 static int mcp251xfd_chip_softreset_do(const struct mcp251xfd_priv *priv)