[PATCH] insque: fix segfault on (prev == NULL)

[Bernhard Reutner-Fischer]

On Tue, Jun 18, 2013 at 11:02:20PM +0200, Bartosz Golaszewski wrote:
>Since version 2.5 glibc allows prev to be a NULL pointer in insque, whereas
>uClibc segfaults in this case. This fixes the issue and makes insque
>initialize q_forw and q_back with NULLs if prev == NULL.

Applied, thanks!