drm/amdgpu: Fix missing unlocking in an error path in amdgpu_userq_create()

If kasprintf() fails, some mutex still need to be released to avoid locking
issue, as already done in all other error handling path.

Fixes: c03ea34 ("drm/amdgpu: add support of debugfs for mqd information")
Reviewed-by: Alex Deucher <[email protected]>
Signed-off-by: Christophe JAILLET <[email protected]>
Link: https://lore.kernel.org/all/366557fa7ca8173fd78c58336986ca56953369b9.1752087753.git.christophe.jaillet@wanadoo.fr/
Signed-off-by: Alex Deucher <[email protected]>

Author: tititiou36

drivers/gpu/drm/amd/amdgpu/amdgpu_userq.c

@@ -521,8 +521,10 @@ amdgpu_userq_create(struct drm_file *filp, union drm_amdgpu_userq *args)
 	}
 
 	queue_name = kasprintf(GFP_KERNEL, "queue-%d", qid);
-	if (!queue_name)
-		return -ENOMEM;
+	if (!queue_name) {
+		r = -ENOMEM;
+		goto unlock;
+	}
 
 #if defined(CONFIG_DEBUG_FS)
 	/* Queue dentry per client to hold MQD information   */