ext4: rename EXT4_IOC_GOINGDOWN to EXT4_IOC_SHUTDOWN

It's very likely the file system independent ioctl name will be
FS_IOC_SHUTDOWN, so let's use the same name for the ext4 ioctl name.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 55b7a77a..3a87378 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -679,7 +679,7 @@ struct fsxattr {
 #define EXT4_IOC_FSGETXATTR		FS_IOC_FSGETXATTR
 #define EXT4_IOC_FSSETXATTR		FS_IOC_FSSETXATTR
 
-#define EXT4_IOC_GOINGDOWN _IOR ('X', 125, __u32)
+#define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
 
 /*
  * Flags for going down operation