The code contains some technical debt in error handling,
which complicates the consolidation of duplicated code.

Introduce an fatal() function to replace the common pattern of
err_msg() followed by exit(EXIT_FAILURE), reducing the length of an
already long function.

Further patches using fatal() follow.

Signed-off-by: Costa Shulyupin <redacted>
---
 tools/tracing/rtla/src/osnoise_hist.c  | 42 ++++++++--------------
 tools/tracing/rtla/src/osnoise_top.c   | 42 ++++++++--------------
 tools/tracing/rtla/src/timerlat_hist.c | 50 +++++++++-----------------
 tools/tracing/rtla/src/timerlat_top.c  | 48 +++++++++----------------
 tools/tracing/rtla/src/timerlat_u.c    | 12 +++----
 tools/tracing/rtla/src/utils.c         | 14 ++++++++
 tools/tracing/rtla/src/utils.h         |  1 +
 7 files changed, 80 insertions(+), 129 deletions(-)

diff --git a/tools/tracing/rtla/src/osnoise_hist.c b/tools/tracing/rtla/src/osnoise_hist.c
index dffb6d0a98d7..43c323521f55 100644
--- a/tools/tracing/rtla/src/osnoise_hist.c
+++ b/tools/tracing/rtla/src/osnoise_hist.c

@@ -592,10 +592,8 @@ static struct common_params
 			break;
 		case 'e':
 			tevent = trace_event_alloc(optarg);
-			if (!tevent) {
-				err_msg("Error alloc trace event");
-				exit(EXIT_FAILURE);
-			}
+			if (!tevent)
+				fatal("Error alloc trace event");
 
 			if (params->common.events)
 				tevent->next = params->common.events;

@@ -615,10 +613,8 @@ static struct common_params
 		case 'H':
 			params->common.hk_cpus = 1;
 			retval = parse_cpu_set(optarg, &params->common.hk_cpu_set);
-			if (retval) {
-				err_msg("Error parsing house keeping CPUs\n");
-				exit(EXIT_FAILURE);
-			}
+			if (retval)
+				fatal("Error parsing house keeping CPUs\n");