src/jtag/aice: Fix obviously incorrect bit op.

src/jtag/aice: Fix obviously incorrect bit op.

Fix expression "(pin_status | 0x4)" which was always true rather than
testing a bit. Untested - was clearly not expressing the intent of the
author by inspection. Found by automated tooling and rtrieu@google.com.

Signed-off-by: Seth LaForge <sethml@google.com>
Change-Id: I4bb91e60e8ce9757bf21976cc48de6f85a39c68d
Reviewed-on: http://openocd.zylin.com/5301
Tested-by: jenkins
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Reviewed-by: Tomas Vanek <vanekt@fbl.cz>