mm/sparse.c: improve the error handling for sparse_add_one_section()

Improve the error handling for mm/sparse.c::sparse_add_one_section().  And I
see no reason to check 'usemap' until holding the 'pgdat_resize_lock'.

[[email protected]: sparse_index_init() returns -EEXIST]
Cc: Christoph Lameter <[email protected]>
Acked-by: Dave Hansen <[email protected]>
Cc: Rik van Riel <[email protected]>
Acked-by: Yasunori Goto <[email protected]>
Cc: Andy Whitcroft <[email protected]>
Signed-off-by: WANG Cong <[email protected]>
Signed-off-by: Geoff Levand <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions