[patch -next] net: dwc-xlgmac: fix an error code in xlgmac_alloc_pages()

[Dan Carpenter]

The dma_mapping_error() returns true if there is an error but we want
to return -ENOMEM and not 1.

Fixes: 65e0ace2c5cd ("net: dwc-xlgmac: Initial driver for DesignWare Enterprise 
Ethernet")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>

diff --git a/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c 
b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
index 55c796ed7d26..39b5cb967bba 100644
--- a/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
+++ b/drivers/net/ethernet/synopsys/dwc-xlgmac-desc.c
@@ -335,7 +335,6 @@ static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
 {
        struct page *pages = NULL;
        dma_addr_t pages_dma;
-       int ret;
 
        /* Try to obtain pages, decreasing order if necessary */
        gfp |= __GFP_COLD | __GFP_COMP | __GFP_NOWARN;
@@ -352,10 +351,9 @@ static int xlgmac_alloc_pages(struct xlgmac_pdata *pdata,
        /* Map the pages */
        pages_dma = dma_map_page(pdata->dev, pages, 0,
                                 PAGE_SIZE << order, DMA_FROM_DEVICE);
-       ret = dma_mapping_error(pdata->dev, pages_dma);
-       if (ret) {
+       if (dma_mapping_error(pdata->dev, pages_dma)) {
                put_page(pages);
-               return ret;
+               return -ENOMEM;
        }
 
        pa->pages = pages;