drm/bochs: downgrade pci_request_region failure from error to warning

Shutdown of firmware framebuffer has a bunch of problems.  Because
of this the framebuffer region might still be reserved even after
drm_fb_helper_remove_conflicting_pci_framebuffers() returned.

Don't consider pci_request_region() failure for the framebuffer
region as fatal error to workaround this issue.
Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Acked-by: Sam Ravnborg <sam@ravnborg.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200313084152.2734-1-kraxel@redhat.com

drivers/gpu/drm/bochs/bochs_hw.c

@@ -156,10 +156,8 @@ int bochs_hw_init(struct drm_device *dev)
 		size = min(size, mem);
 	}
 
-	if (pci_request_region(pdev, 0, "bochs-drm") != 0) {
-		DRM_ERROR("Cannot request framebuffer\n");
-		return -EBUSY;
-	}
+	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
+		DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
 
 	bochs->fb_map = ioremap(addr, size);
 	if (bochs->fb_map == NULL) {