clk: bcm: rpi: Fix error handling of raspberrypi_fw_get_rate

The function raspberrypi_fw_get_rate (e.g. used for the recalc_rate
hook) can fail to get the clock rate from the firmware. In this case
we cannot return a signed error value, which would be casted to
unsigned long. Fix this by returning 0 instead.

Signed-off-by: Stefan Wahren <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Fixes: 4e85e53 ("clk: bcm283x: add driver interfacing with Raspberry Pi's firmware")
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

Author: lategoodbye

drivers/clk/bcm/clk-raspberrypi.c

@@ -203,7 +203,7 @@ static unsigned long raspberrypi_fw_get_rate(struct clk_hw *hw,
 	ret = raspberrypi_clock_property(rpi->firmware, data,
 					 RPI_FIRMWARE_GET_CLOCK_RATE, &val);
 	if (ret)
-		return ret;
+		return 0;
 
 	return val;
 }