gf_general.c: fix pointless expression
gf_general.c: fix pointless expression

Instead of checking w128[0] twice check for w128[0] and w128[1].

Fix for coverity issue from Ceph project:

CID 1193072 (#1 of 1): Same on both sides (CONSTANT_EXPRESSION_RESULT)
 pointless_expression: The expression v1->w128[0] == v2->w128[0] &&
 v1->w128[0] == v2->w128[0] does not accomplish anything because it
 evaluates to either of its identical operands, v1->w128[0] == v2->w128[0].
 Did you intend the operands to be different?

Signed-off-by: Danny Al-Gaaf <473e39ac77cf392f0dd9bacde8409de76c14d006@bisect.de>

ceph/gf-complete,cedricde/gf-complete,ceph/gf-complete,zzxuanyuan/gf-complete,zzxuanyuan/gf-complete,cedricde/gf-complete,ceph/gf-complete