brcmfmac: fix pkt_filter sizeof calculation.

sizeof calculation in setting pkt_filter was incorrect. This
patch fixes that and removes related defines which have become
obsolete.
Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Franky Lin <frankyl@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

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

@@ -42,10 +42,6 @@
 
 #define MSGTRACE_VERSION	1
 
-#define BRCMF_PKT_FILTER_FIXED_LEN	offsetof(struct brcmf_pkt_filter_le, u)
-#define BRCMF_PKT_FILTER_PATTERN_FIXED_LEN	\
-	offsetof(struct brcmf_pkt_filter_pattern_le, mask_and_pattern)
-
 #ifdef DEBUG
 static const char brcmf_version[] =
 	"Dongle Host Driver, version " BRCMF_VERSION_STR "\nCompiled on "
@@ -686,8 +682,8 @@ static void brcmf_c_pktfilter_offload_set(struct brcmf_if *ifp, char *arg)
 	}
 
 	pkt_filter->u.pattern.size_bytes = cpu_to_le32(mask_size);
-	buf_len = sizeof(*pkt_filter);
-	buf_len -= sizeof(pkt_filter->u.pattern.mask_and_pattern);
+	buf_len = offsetof(struct brcmf_pkt_filter_le,
+			   u.pattern.mask_and_pattern);
 	buf_len += mask_size + pattern_size;
 
 	err = brcmf_fil_iovar_data_set(ifp, "pkt_filter_add", pkt_filter,