wifi: brcmfmac: fix gnu_printf warnings

With GCC 13.1 and W=1 brcmfmac has warnings like this:

./include/trace/perf.h:26:16: warning: function 'perf_trace_brcmf_dbg' might be a candidate for 'gnu_printf' format attribute [-Wsuggest-attribute=format]

Add a workaround which disables -Wsuggest-attribute=format in tracepoint.h. I
see similar workarounds in other drivers as well.

Compile tested only.
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230613140918.389690-2-kvalo@kernel.org

drivers/net/wireless/broadcom/brcm80211/brcmfmac/tracepoint.h

@@ -28,6 +28,11 @@ static inline void trace_ ## name(proto) {}
 
 #define MAX_MSG_LEN		100
 
+#pragma GCC diagnostic push
+#ifndef __clang__
+#pragma GCC diagnostic ignored "-Wsuggest-attribute=format"
+#endif
+
 TRACE_EVENT(brcmf_err,
 	TP_PROTO(const char *func, struct va_format *vaf),
 	TP_ARGS(func, vaf),
@@ -123,6 +128,8 @@ TRACE_EVENT(brcmf_sdpcm_hdr,
 		  __entry->len, ((u8 *)__get_dynamic_array(hdr))[4])
 );
 
+#pragma GCC diagnostic pop
+
 #ifdef CONFIG_BRCM_TRACING
 
 #undef TRACE_INCLUDE_PATH