nouveau/svm: Split assignment from if conditional

Fix checkpatch.pl ERROR: do not use assignment in if condition.

Signed-off-by: "Gustavo A. R. Silva" <gustavoars@kernel.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/6b900e80b5587187c68efc788f5b042ca747d374.1692208802.git.gustavoars@kernel.org
Signed-off-by: Kees Cook <keescook@chromium.org>

Author: GustavoARSilva

drivers/gpu/drm/nouveau/nouveau_svm.c

@@ -1063,7 +1063,8 @@ nouveau_svm_init(struct nouveau_drm *drm)
 	if (drm->client.device.info.family > NV_DEVICE_INFO_V0_PASCAL)
 		return;
 
-	if (!(drm->svm = svm = kzalloc(struct_size(drm->svm, buffer, 1), GFP_KERNEL)))
+	drm->svm = svm = kzalloc(struct_size(drm->svm, buffer, 1), GFP_KERNEL);
+	if (!drm->svm)
 		return;
 
 	drm->svm->drm = drm;