xattr: Constify ->name member of "struct xattr".

xattr: Constify ->name member of "struct xattr".

Since everybody sets kstrdup()ed constant string to "struct xattr"->name but
nobody modifies "struct xattr"->name , we can omit kstrdup() and its failure
checking by constifying ->name member of "struct xattr".

Signed-off-by: Tetsuo Handa <[email protected]>
Reviewed-by: Joel Becker <[email protected]> [ocfs2]
Acked-by: Serge E. Hallyn <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
Acked-by: Mimi Zohar <[email protected]>
Reviewed-by: Paul Moore <[email protected]>
Tested-by: Paul Moore <[email protected]>
Acked-by: Eric Paris <[email protected]>
Signed-off-by: James Morris <[email protected]>