brcmfmac: Using zero instead of NULL

Sparse complains that we use zero instead of NULL here.  In fact, the
initialization is wrong and should be removed.  Doing these kinds of
bogus initializations means that GCC can't detect unitialized variables
and leads to bugs.
Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Reviewed-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/brcm80211/brcmfmac/wl_cfg80211.c

@@ -3972,8 +3972,8 @@ brcmf_set_management_ie(struct brcmf_cfg80211_info *cfg,
 	u8  *iovar_ie_buf;
 	u8  *curr_ie_buf;
 	u8  *mgmt_ie_buf = NULL;
-	u32 mgmt_ie_buf_len = 0;
-	u32 *mgmt_ie_len = 0;
+	u32 mgmt_ie_buf_len;
+	u32 *mgmt_ie_len;
 	u32 del_add_ie_buf_len = 0;
 	u32 total_ie_buf_len = 0;
 	u32 parsed_ie_buf_len = 0;
@@ -3995,8 +3995,7 @@ brcmf_set_management_ie(struct brcmf_cfg80211_info *cfg,
 		case VNDR_IE_PRBRSP_FLAG:
 			mgmt_ie_buf = cfg->ap_info->probe_res_ie;
 			mgmt_ie_len = &cfg->ap_info->probe_res_ie_len;
-			mgmt_ie_buf_len =
-				sizeof(cfg->ap_info->probe_res_ie);
+			mgmt_ie_buf_len = sizeof(cfg->ap_info->probe_res_ie);
 			break;
 		case VNDR_IE_BEACON_FLAG:
 			mgmt_ie_buf = cfg->ap_info->beacon_ie;