tty: serial: Modify the use of dev_err_probe()

The dev_err_probe() doesn't do anything when error is '-ENOMEM'.
Make the following two changes:
(1) Replace -ENOMEM with -ENOSPC in max3100_probe().
(2) Just return -ENOMEM instead in max310x_probe().

Signed-off-by: Xichao Zhao <zhao.xichao@vivo.com>
Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Link: https://lore.kernel.org/r/20250819120927.607744-1-zhao.xichao@vivo.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: Xichao Zhao

drivers/tty/serial/max3100.c

@@ -705,7 +705,7 @@ static int max3100_probe(struct spi_device *spi)
 			break;
 	if (i == MAX_MAX3100) {
 		mutex_unlock(&max3100s_lock);
-		return dev_err_probe(dev, -ENOMEM, "too many MAX3100 chips\n");
+		return dev_err_probe(dev, -ENOSPC, "too many MAX3100 chips\n");
 	}
 
 	max3100s[i] = kzalloc(sizeof(struct max3100_port), GFP_KERNEL);

drivers/tty/serial/max310x.c

@@ -1269,8 +1269,7 @@ static int max310x_probe(struct device *dev, const struct max310x_devtype *devty
 	/* Alloc port structure */
 	s = devm_kzalloc(dev, struct_size(s, p, devtype->nr), GFP_KERNEL);
 	if (!s)
-		return dev_err_probe(dev, -ENOMEM,
-				     "Error allocating port structure\n");
+		return -ENOMEM;
 
 	/* Always ask for fixed clock rate from a property. */
 	device_property_read_u32(dev, "clock-frequency", &uartclk);