i915: Fix sense of conditional for i915_gem_mmap_ioctl ABI hack.

Original issue and fix described here:

https://mail-index.netbsd.org/source-changes/2018/08/27/msg098501.html

This was broken in the merge in 2021, and I tried to restore it but
got the sense of the conditional wrong:

https://mail-index.netbsd.org/source-changes/2021/12/19/msg135215.html

Author: riastradh

sys/external/bsd/drm2/dist/drm/i915/gem/i915_gem_mman.c

@@ -1,4 +1,4 @@
-/*	$NetBSD: i915_gem_mman.c,v 1.27 2024/06/23 19:37:11 riastradh Exp $	*/
+/*	$NetBSD: i915_gem_mman.c,v 1.28 2025/01/26 20:49:22 riastradh Exp $	*/
 
 /*
  * SPDX-License-Identifier: MIT
@@ -7,7 +7,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: i915_gem_mman.c,v 1.27 2024/06/23 19:37:11 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: i915_gem_mman.c,v 1.28 2025/01/26 20:49:22 riastradh Exp $");
 
 #include <linux/anon_inodes.h>
 #include <linux/mman.h>
@@ -83,7 +83,7 @@ i915_gem_mmap_ioctl(struct drm_device *dev, void *data,
 
 #ifdef __NetBSD__
 	struct drm_i915_private *i915 = to_i915(obj->base.dev);
-	if (i915->quirks & QUIRK_NETBSD_VERSION_CALLED)
+	if ((i915->quirks & QUIRK_NETBSD_VERSION_CALLED) == 0)
 		args->flags = 0;
 #endif