firewire: Convert snprintf/sprintf to sysfs_emit

Per filesystems/sysfs.rst, show() should only use sysfs_emit()
or sysfs_emit_at() when formatting the value to be returned to user space.

coccinelle complains that there are still a couple of functions that use
snprintf(). Convert them to sysfs_emit().

> drivers/firewire/core-device.c:326:8-16: WARNING: please use sysfs_emit or sysfs_emit_at

No functional change intended

Signed-off-by: Li Zhijian <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Takashi Sakamoto <[email protected]>

drivers/firewire/core-device.c

@@ -322,7 +322,7 @@ static ssize_t show_immediate(struct device *dev,
  if (value < 0)
  return -ENOENT;
 
- return snprintf(buf, PAGE_SIZE, "0x%06x\n", value);
+ return sysfs_emit(buf, "0x%06x\n", value);
 }
 
 #define IMMEDIATE_ATTR(name, key) \
@@ -482,7 +482,7 @@ static ssize_t is_local_show(struct device *dev,
 {
  struct fw_device *device = fw_device(dev);
 
- return sprintf(buf, "%u\n", device->is_local);
+ return sysfs_emit(buf, "%u\n", device->is_local);
 }
 
 static int units_sprintf(char *buf, const u32 *directory)