ath6kl: Unify sg_sz and buf_sz in ath6kl_sdio_alloc_prep_scat_req()

sg_sz and buf_sz are initialized and used in a mutual exclusive way.
However, some versions of gcc are not smart enough to see this:

drivers/net/wireless/ath/ath6kl/sdio.c: In function ‘ath6kl_sdio_alloc_prep_scat_req’:
drivers/net/wireless/ath/ath6kl/sdio.c:338: warning: ‘sg_sz’ may be used uninitialized in this function

Unify the sg_sz and buf_sz variables into a single size variable to kill
the compiler warning.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>

drivers/net/wireless/ath/ath6kl/sdio.c

@@ -345,17 +345,17 @@ static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
 {
 	struct hif_scatter_req *s_req;
 	struct bus_request *bus_req;
-	int i, scat_req_sz, scat_list_sz, sg_sz, buf_sz;
+	int i, scat_req_sz, scat_list_sz, size;
 	u8 *virt_buf;
 
 	scat_list_sz = (n_scat_entry - 1) * sizeof(struct hif_scatter_item);
 	scat_req_sz = sizeof(*s_req) + scat_list_sz;
 
 	if (!virt_scat)
-		sg_sz = sizeof(struct scatterlist) * n_scat_entry;
+		size = sizeof(struct scatterlist) * n_scat_entry;
 	else
-		buf_sz =  2 * L1_CACHE_BYTES +
-			  ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
+		size =  2 * L1_CACHE_BYTES +
+			ATH6KL_MAX_TRANSFER_SIZE_PER_SCATTER;
 
 	for (i = 0; i < n_scat_req; i++) {
 		/* allocate the scatter request */
@@ -364,7 +364,7 @@ static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
 			return -ENOMEM;
 
 		if (virt_scat) {
-			virt_buf = kzalloc(buf_sz, GFP_KERNEL);
+			virt_buf = kzalloc(size, GFP_KERNEL);
 			if (!virt_buf) {
 				kfree(s_req);
 				return -ENOMEM;
@@ -374,7 +374,7 @@ static int ath6kl_sdio_alloc_prep_scat_req(struct ath6kl_sdio *ar_sdio,
 				(u8 *)L1_CACHE_ALIGN((unsigned long)virt_buf);
 		} else {
 			/* allocate sglist */
-			s_req->sgentries = kzalloc(sg_sz, GFP_KERNEL);
+			s_req->sgentries = kzalloc(size, GFP_KERNEL);
 
 			if (!s_req->sgentries) {
 				kfree(s_req);