regcomp.c: Use PL_sv_undef instead of NULL in an AV
authorKarl Williamson <public@khwilliamson.com>
Fri, 2 Aug 2013 18:33:07 +0000 (12:33 -0600)
committerKarl Williamson <public@khwilliamson.com>
Tue, 24 Sep 2013 17:36:12 +0000 (11:36 -0600)
commit736d4498bb6fcdcbdbe19d1990bc08319ef4417a
tree413515eba0fe0ac3fe964ce4bb6f40556808eced
parentb8f7bb16f63b8e72236f34002e68da18767fe62c
regcomp.c: Use PL_sv_undef instead of NULL in an AV

The NULL gets turned into an SVt_NULL anyway.  This array is read only
by S_core_regclass_swash() in regexec.c.  That uses an SvROK, so it
doesn't have to change.

This commit also beefs up the comments around this operation
regcomp.c