perf cs-etm: Mute enumeration value warning

When the OpenCSD library introduces a new enumeration value (for example,
in the v1.7.1 release), the perf build fails with an error:

  util/cs-etm-decoder/cs-etm-decoder.c:600:10: error: enumeration value 'OCSD_GEN_TRC_ELEM_ITMTRACE' not explicitly handled in switch [-Werror, -Wswitch-enum]
    600 |         switch (elem->elem_type) {
	|                 ^~~~~~~~~~~~~~~
  1 error generated.

Convert to if-else sentences to mute the enumeration value warning,
which can avoid build failures whenever the lib is updated.

No functional change.

Suggested-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Author: Leo-Yan

tools/perf/util/cs-etm-decoder/cs-etm-decoder.c

@@ -588,6 +588,7 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 				const ocsd_generic_trace_elem *elem)
 {
 	ocsd_datapath_resp_t resp = OCSD_RESP_CONT;
+	ocsd_gen_trc_elem_t type;
 	struct cs_etm_decoder *decoder = (struct cs_etm_decoder *) context;
 	struct cs_etm_queue *etmq = decoder->data;
 	struct cs_etm_packet_queue *packet_queue;
@@ -597,52 +598,29 @@ static ocsd_datapath_resp_t cs_etm_decoder__gen_trace_elem_printer(
 	if (!packet_queue)
 		return OCSD_RESP_FATAL_SYS_ERR;
 
-	switch (elem->elem_type) {
-	case OCSD_GEN_TRC_ELEM_UNKNOWN:
-		break;
-	case OCSD_GEN_TRC_ELEM_EO_TRACE:
-	case OCSD_GEN_TRC_ELEM_NO_SYNC:
-	case OCSD_GEN_TRC_ELEM_TRACE_ON:
+	type = elem->elem_type;
+
+	if (type == OCSD_GEN_TRC_ELEM_EO_TRACE ||
+	    type == OCSD_GEN_TRC_ELEM_NO_SYNC ||
+	    type == OCSD_GEN_TRC_ELEM_TRACE_ON)
 		resp = cs_etm_decoder__buffer_discontinuity(etmq, packet_queue,
 							    trace_chan_id);
-		break;
-	case OCSD_GEN_TRC_ELEM_INSTR_RANGE:
+	else if (type == OCSD_GEN_TRC_ELEM_INSTR_RANGE)
 		resp = cs_etm_decoder__buffer_range(etmq, packet_queue, elem,
 						    trace_chan_id);
-		break;
-	case OCSD_GEN_TRC_ELEM_EXCEPTION:
+	else if (type == OCSD_GEN_TRC_ELEM_EXCEPTION)
 		resp = cs_etm_decoder__buffer_exception(etmq, packet_queue, elem,
 							trace_chan_id);
-		break;
-	case OCSD_GEN_TRC_ELEM_EXCEPTION_RET:
+	else if (type == OCSD_GEN_TRC_ELEM_EXCEPTION_RET)
 		resp = cs_etm_decoder__buffer_exception_ret(etmq, packet_queue,
 							    trace_chan_id);
-		break;
-	case OCSD_GEN_TRC_ELEM_TIMESTAMP:
+	else if (type == OCSD_GEN_TRC_ELEM_TIMESTAMP)
 		resp = cs_etm_decoder__do_hard_timestamp(etmq, elem,
 							 trace_chan_id,
 							 indx);
-		break;
-	case OCSD_GEN_TRC_ELEM_PE_CONTEXT:
+	else if (type == OCSD_GEN_TRC_ELEM_PE_CONTEXT)
 		resp = cs_etm_decoder__set_tid(etmq, packet_queue,
 					       elem, trace_chan_id);
-		break;
-	/* Unused packet types */
-	case OCSD_GEN_TRC_ELEM_I_RANGE_NOPATH:
-	case OCSD_GEN_TRC_ELEM_ADDR_NACC:
-	case OCSD_GEN_TRC_ELEM_CYCLE_COUNT:
-	case OCSD_GEN_TRC_ELEM_ADDR_UNKNOWN:
-	case OCSD_GEN_TRC_ELEM_EVENT:
-	case OCSD_GEN_TRC_ELEM_SWTRACE:
-	case OCSD_GEN_TRC_ELEM_CUSTOM:
-	case OCSD_GEN_TRC_ELEM_SYNC_MARKER:
-	case OCSD_GEN_TRC_ELEM_MEMTRANS:
-#if (OCSD_VER_NUM >= 0x010400)
-	case OCSD_GEN_TRC_ELEM_INSTRUMENTATION:
-#endif
-	default:
-		break;
-	}
 
 	return resp;
 }