argo: correct logline in ring_unmap()

Drop XENLOG_ERR from the logline since argo_dprintk() already injects
the proper log level indicator.

Also, drop "argo: " prefix, since it is also injected by argo_dprintk()

Signed-off-by: Denis Mukhin <dmukhin@ford.com>
Reviewed-by: Mykola Kvach <mykola_kvach@epam.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Reviewed-by: Jason Andryuk <jason.andryuk@amd.com>
Release-Acked-by: Oleksii Kurochko <oleksii.kurochko@gmail.com>

xen/common/argo.c

@@ -474,7 +474,7 @@ ring_unmap(const struct domain *d, struct argo_ring_info *ring_info)
             continue;
 
         ASSERT(!mfn_eq(ring_info->mfns[i], INVALID_MFN));
-        argo_dprintk(XENLOG_ERR "argo: unmapping page %"PRI_mfn" from %p\n",
+        argo_dprintk("unmapping page %"PRI_mfn" from %p\n",
                      mfn_x(ring_info->mfns[i]), ring_info->mfn_mapping[i]);
 
         unmap_domain_page_global(ring_info->mfn_mapping[i]);