ata: libata-transport: replace scnprintf with sysfs_emit for simple attributes

sprintf, snprintf, and scnprintf do not consider the PAGE_SIZE maximum
of the temporary buffer used for outputting sysfs content and they may
overrun the PAGE_SIZE buffer length.

To avoid output defects with the ATA transport class simple attributes,
use sysfs_emit instead of scnprintf().

This aligns with the sysfs guidance provided in
Documentation/filesystems/sysfs.rst.

Signed-off-by: Jonathan Velez <jonvelez12345@gmail.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20250709133330.3546-1-jonvelez12345@gmail.com
Signed-off-by: Niklas Cassel <cassel@kernel.org>

Author: Jonathan Velez

drivers/ata/libata-transport.c

@@ -202,7 +202,7 @@ show_ata_port_##name(struct device *dev,				\
 {									\
 	struct ata_port *ap = transport_class_to_port(dev);		\
 									\
-	return scnprintf(buf, 20, format_string, cast ap->field);	\
+	return sysfs_emit(buf, format_string, cast ap->field);	        \
 }
 
 #define ata_port_simple_attr(field, name, format_string, type)		\
@@ -389,7 +389,7 @@ show_ata_dev_##field(struct device *dev,				\
 {									\
 	struct ata_device *ata_dev = transport_class_to_dev(dev);	\
 									\
-	return scnprintf(buf, 20, format_string, cast ata_dev->field);	\
+	return sysfs_emit(buf, format_string, cast ata_dev->field);	\
 }
 
 #define ata_dev_simple_attr(field, format_string, type)		\