ext2: code cleanup by removing ifdef macro surrounding

Define ext2_listxattr to NULL when CONFIG_EROFS_FS_XATTR
is not enabled, then we can remove many ugly ifdef macros
in the code.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Chengguang Xu <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>

fs/ext2/file.c

···
 };
 
 const struct inode_operations ext2_file_inode_operations = {
-#ifdef CONFIG_EXT2_FS_XATTR
 	.listxattr	= ext2_listxattr,
-#endif
 	.getattr	= ext2_getattr,
 	.setattr	= ext2_setattr,
 	.get_acl	= ext2_get_acl,

fs/ext2/namei.c

···
 	.rmdir		= ext2_rmdir,
 	.mknod		= ext2_mknod,
 	.rename		= ext2_rename,
-#ifdef CONFIG_EXT2_FS_XATTR
 	.listxattr	= ext2_listxattr,
-#endif
 	.getattr	= ext2_getattr,
 	.setattr	= ext2_setattr,
 	.get_acl	= ext2_get_acl,
···
 };
 
 const struct inode_operations ext2_special_inode_operations = {
-#ifdef CONFIG_EXT2_FS_XATTR
 	.listxattr	= ext2_listxattr,
-#endif
 	.getattr	= ext2_getattr,
 	.setattr	= ext2_setattr,
 	.get_acl	= ext2_get_acl,

fs/ext2/symlink.c

···
 	.get_link	= page_get_link,
 	.getattr	= ext2_getattr,
 	.setattr	= ext2_setattr,
-#ifdef CONFIG_EXT2_FS_XATTR
 	.listxattr	= ext2_listxattr,
-#endif
 };
  
 const struct inode_operations ext2_fast_symlink_inode_operations = {
 	.get_link	= simple_get_link,
 	.getattr	= ext2_getattr,
 	.setattr	= ext2_setattr,
-#ifdef CONFIG_EXT2_FS_XATTR
 	.listxattr	= ext2_listxattr,
-#endif
 };

fs/ext2/xattr.h

···
 }
 
 #define ext2_xattr_handlers NULL
+#define ext2_listxattr NULL
 
 # endif  /* CONFIG_EXT2_FS_XATTR */