Some cleanup in X509_REQ_get_extensions(3), no functional change.

In this function, merge everything that is worth merging
from the OpenSSL 1.1.1 branch, which is still under a free license,
mostly the relevant part of commit 9b0a4531 Mar 14 23:48:47 2015 +0000
to use X509_ATTRIBUTE_get0_type(3) rather than re-implementing it.

While here,
* use d2i_X509_EXTENSIONS(3) rather than ASN1_item_d2i(3);
* test pointers explicitly against NULL, not with '!', as suggested by tb@;
* drop some useless parentheses as suggested by tb@.

OK tb@

0 files changed, 0 insertions, 0 deletions