drivers: entropy: fail mcux CAAM init on error

Commit d556a0c
("drivers: entropy: Add entropy driver for MCUX CAAM")
added a shim entropy driver whose initialization function
always returns 0, even when the underlying HAL API fails.

This is wrong; if the device initialization function fails, it must
return nonzero by contract. Papering this over with an assert is not
enough. Fix it by returning -ENODEV on error.

Signed-off-by: Martí Bolívar <[email protected]>

Author: mbolivar-nordic

drivers/entropy/entropy_mcux_caam.c

@@ -57,6 +57,10 @@ static int entropy_mcux_caam_init(const struct device *dev)
 	status = CAAM_Init(config->base, &conf);
 	__ASSERT_NO_MSG(!status);
 
+	if (status != 0) {
+		return -ENODEV;
+	}
+
 	return 0;
 }