s390/pci: Switch over to sysfs_emit

Per Documentation/filesystems/sysfs.rst, sysfs_emit() is preferred over
sprintf for presenting attributes to user space. Convert over two
left-over uses in the s390 PCI code.

Reviewed-by: Niklas Schnelle <[e-mail]>
Signed-off-by: Gerd Bayer <[e-mail]>
Signed-off-by: Heiko Carstens <[e-mail]>

arch/s390/pci/pci_sysfs.c

···
 {									\
 	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));		\
 									\
-	return sprintf(buf, fmt, zdev->member);				\
+	return sysfs_emit(buf, fmt, zdev->member);				\
 }									\
 static DEVICE_ATTR_RO(name)
 
···
 {
 	struct zpci_dev *zdev = to_zpci(to_pci_dev(dev));
 
-	return sprintf(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
+	return sysfs_emit(buf, zpci_use_mio(zdev) ? "1\n" : "0\n");
 }
 static DEVICE_ATTR_RO(mio_enabled);