libvulkan: Fix check for redundant vkDeviceQueue calls

dEQP test sets typically create a device once, but call
vkGetDeviceQueue in each test case. Due to this bug we were failing
all but the first call.

Change-Id: If5a07ae23d630e64d06b7028b7e62f389533da43
(cherry picked from commit 8be3d02cb116d82aac0e2c8f50168d816bfec4a0)