gai_init: Avoid jumping from if condition to its else counterpart

gai_init: Avoid jumping from if condition to its else counterpart

Clean up another antipattern where code flows from an if condition to
its else counterpart with a goto.

Most of the change in this patch is whitespace-only; a `git diff -b`
ought to show the actual logic changes.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: DJ Delorie <dj@redhat.com>