[PATCH] FIx explicit null dereference pointer (nbtree.c)

[Ranier Vilela]

Hi,
per Coverity.

1. assign_zero: Assigning: opaque = NULL.
2. Condition buf < 0, taking true branch.
3. Condition !(((PageHeader)page)->pd_upper == 0), taking false branch.
4. Condition blkno != orig_blkno, taking true branch.
5. Condition _bt_page_recyclable(page), taking false branch.
CID 1314742 (#2 of 2): Explicit null dereferenced (FORWARD_NULL)
6. var_deref_op: Dereferencing null pointer opaque.

regards,
Ranier Vilela

fix_explicit_null_dereference_nbtree.patch
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