drm: qxl: remove pr_info message, stops log spamming

Simply mmap'ing /dev/dri/card0 repeatedly will spam the kernel
log with qxl_mmap information messages. The following example code
illustrates this:

int main(void)
{
	int fd = open("/dev/dri/card0", O_RDONLY);
	if (fd == -1)
		err(1, "open failed");

	for (;;) {
		void *m = mmap(NULL, 4096, PROT_READ,
			MAP_SHARED, fd, 0);
		if (m != MAP_FAILED)
			munmap(m, 4096);
	}
}

Stop the spamming by removing the pr_info message. Since the mmap'ing
returns -EINVAL there is no need for the pr_info message.
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170912173422.14062-1-colin.king@canonical.comSigned-off-by: Gerd Hoffmann <kraxel@redhat.com>

drivers/gpu/drm/qxl/qxl_ttm.c

@@ -123,11 +123,8 @@ int qxl_mmap(struct file *filp, struct vm_area_struct *vma)
 	struct qxl_device *qdev;
 	int r;
 
-	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET)) {
-		pr_info("%s: vma->vm_pgoff (%ld) < DRM_FILE_PAGE_OFFSET\n",
-			__func__, vma->vm_pgoff);
+	if (unlikely(vma->vm_pgoff < DRM_FILE_PAGE_OFFSET))
 		return -EINVAL;
-	}
 
 	file_priv = filp->private_data;
 	qdev = file_priv->minor->dev->dev_private;