[PATCH] synclink_gt: make ->init_error signed

Examples of misuse are

3112 info->init_error = -1;

4440 if ((info->init_error = register_test(info)) < 0) {

Signed-off-by: Darren Jenkins <darrenrjenkins@gmail.com>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Paul Fulghum <paulkf@microgate.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>