One semicolon should do just fine here.

Index: dev/usb/xhci.c
===================================================================
RCS file: /cvs/src/sys/dev/usb/xhci.c,v
retrieving revision 1.72
diff -u -p -r1.72 xhci.c
--- dev/usb/xhci.c      10 Mar 2017 11:18:48 -0000      1.72
+++ dev/usb/xhci.c      22 Jun 2017 01:33:58 -0000
@@ -225,7 +225,7 @@ usbd_dma_contig_alloc(struct usbd_bus *b
        error = bus_dmamap_create(dma->tag, size, 1, size, boundary,
            BUS_DMA_NOWAIT, &dma->map);
        if (error != 0)
-               return (error);;
+               return (error);
 
        error = bus_dmamem_alloc(dma->tag, size, alignment, boundary, &dma->seg,
            1, &dma->nsegs, BUS_DMA_NOWAIT | BUS_DMA_ZERO);

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