soc: qcom: smem: fix off-by-one error in qcom_smem_alloc_private()

It's OK if the space for a newly-allocated uncached entry actually
touches the free cached space boundary.  It's only a problem if it
would cross it.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>

drivers/soc/qcom/smem.c

@@ -375,7 +375,7 @@ static int qcom_smem_alloc_private(struct qcom_smem *smem,
 
 	/* Check that we don't grow into the cached region */
 	alloc_size = sizeof(*hdr) + ALIGN(size, 8);
-	if ((void *)hdr + alloc_size >= cached) {
+	if ((void *)hdr + alloc_size > cached) {
 		dev_err(smem->dev, "Out of memory\n");
 		return -ENOSPC;
 	}