staging: brcm80211: use kstrdup()

 Use kstrdup rather than duplicating its implementation

 The semantic patch that makes this output is available
 in scripts/coccinelle/api/kstrdup.cocci.

 More information about semantic patching is available at
 http://coccinelle.lip6.fr/

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/brcm80211/brcmfmac/dhd_common.c

@@ -928,7 +928,7 @@ void brcmf_c_pktfilter_offload_set(struct brcmf_pub *drvr, char *arg)
 	int i = 0;
 	char *arg_save = 0, *arg_org = 0;
 
-	arg_save = kmalloc(strlen(arg) + 1, GFP_ATOMIC);
+	arg_save = kstrdup(arg, GFP_ATOMIC);
 	if (!arg_save) {
 		BRCMF_ERROR(("%s: kmalloc failed\n", __func__));
 		goto fail;
@@ -942,8 +942,6 @@ void brcmf_c_pktfilter_offload_set(struct brcmf_pub *drvr, char *arg)
 		goto fail;
 	}
 
-	strcpy(arg_save, arg);
-
 	argv[i] = strsep(&arg_save, " ");
 	while (argv[i++])
 		argv[i] = strsep(&arg_save, " ");