brcmfmac: of: remove redundant variable len

The variable len is being assigned bit is never used. The variable
and the strlen call are redundant and can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20220207133329.336664-1-colin.i.king@gmail.com

drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c

@@ -71,14 +71,13 @@ void brcmf_of_probe(struct device *dev, enum brcmf_bus_type bus_type,
 	/* Set board-type to the first string of the machine compatible prop */
 	root = of_find_node_by_path("/");
 	if (root) {
-		int i, len;
+		int i;
 		char *board_type;
 		const char *tmp;
 
 		of_property_read_string_index(root, "compatible", 0, &tmp);
 
 		/* get rid of '/' in the compatible string to be able to find the FW */
-		len = strlen(tmp) + 1;
 		board_type = devm_kstrdup(dev, tmp, GFP_KERNEL);
 		if (!board_type) {
 			of_node_put(root);