device/xhci.c: Remove repeated word

Change-Id: Ia1648bd7ba4858268ca5f1a5c7b42b7de717d3d6
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49513
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jacob Garber <jgarber1@ualberta.ca>
diff --git a/src/device/xhci.c b/src/device/xhci.c
index d4cacef..4523b56 100644
--- a/src/device/xhci.c
+++ b/src/device/xhci.c
@@ -36,7 +36,7 @@
 	}
 
 	if (!(res->flags & IORESOURCE_ASSIGNED)) {
-		printk(BIOS_ERR, "%s: BAR is is not assigned\n", __func__);
+		printk(BIOS_ERR, "%s: BAR is not assigned\n", __func__);
 		return CB_ERR;
 	}