drm/i915/lmem: Check against i915_selftest only under CONFIG_SELFTEST

The i915_selftest module parameters only exist when
CONFIG_DRM_I915_SELFTEST is set.
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191101095147.9769-1-chris@chris-wilson.co.uk

drivers/gpu/drm/i915/i915_drv.c

@@ -1487,6 +1487,7 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	 * Check if we support fake LMEM -- for now we only unleash this for
 	 * the live selftests(test-and-exit).
 	 */
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
 	if (IS_ENABLED(CONFIG_DRM_I915_UNSTABLE_FAKE_LMEM)) {
 		if (INTEL_GEN(dev_priv) >= 9 && i915_selftest.live < 0 &&
 		    i915_modparams.fake_lmem_start) {
@@ -1497,6 +1498,7 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 			GEM_BUG_ON(!IS_DGFX(dev_priv));
 		}
 	}
+#endif
 
 	ret = pci_enable_device(pdev);
 	if (ret)