[PATCH -next] drm/vmwgfx: Fix return value check in vmw_setup_pci_resources()

[Qiheng Lin]

In case of error, the function devm_ioremap() returns NULL pointer not 
ERR_PTR().
The IS_ERR() test in the return value check should be replaced with NULL test.
After that, the error code -ENOMEM should be returned.

Reported-by: Hulk Robot <hul...@huawei.com>
Signed-off-by: Qiheng Lin <linqih...@huawei.com>
---
 drivers/gpu/drm/vmwgfx/vmwgfx_drv.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c 
b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
index 5cf3a5bf539f..6f5ea00973e0 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_drv.c
@@ -719,10 +719,10 @@ static int vmw_setup_pci_resources(struct vmw_private 
*dev,
                dev->rmmio = devm_ioremap(dev->drm.dev,
                                          rmmio_start,
                                          rmmio_size);
-               if (IS_ERR(dev->rmmio)) {
+               if (!dev->rmmio) {
                        DRM_ERROR("Failed mapping registers mmio memory.\n");
                        pci_release_regions(pdev);
-                       return PTR_ERR(dev->rmmio);
+                       return -ENOMEM;
                }
        } else if (pci_id == VMWGFX_PCI_ID_SVGA2) {
                dev->io_start = pci_resource_start(pdev, 0);