rs485echo: fix segmentation fault in echo mode

Currently, rs485echo does not start in echo mode:

root@GFMM03731060:~# /opt/ltp/testcases/bin/rs485echo -e
Segmentation fault
root@GFMM03731060:~# 

This MR fixes that.

Note: as this is a fix for an application, we did not test pipeline images and did not collect logs/

assigned to @mikhail.vanyulin

changed the description

requested review from @jonas.hoeppner

⮘ seconorth-fngsystem | seco-genio510 ⮚
├── artifacts.zip size: [ 253.04 MiB → 253.04 MiB ] | +97 B
├── image size: [ 37.1 MiB → 37.1 MiB ]
└── manifest diff:

⮘ seconorth-fngsystem | seco-genio700 ⮚
├── artifacts.zip size: [ 252.93 MiB → 252.93 MiB ] | -19 B
├── image size: [ 37.1 MiB → 37.1 MiB ]
└── manifest diff:

⮘ seconorth-fngsystem | seco-mx6 ⮚
├── artifacts.zip size: [ 99.24 MiB → 99.24 MiB ] | -950 B
├── image size: [ 26 MiB → 26 MiB ]
└── manifest diff:

⮘ seconorth-fngsystem | seco-mx6ull ⮚
├── artifacts.zip size: [ 87.22 MiB → 87.22 MiB ] | +562 B
├── image size: [ 24.5 MiB → 24.5 MiB ]
└── manifest diff:

⮘ seconorth-fngsystem | seco-mx8mm ⮚
├── artifacts.zip size: [ 269.31 MiB → 269.31 MiB ] | +773 B
├── image size: [ 36.6 MiB → 36.6 MiB ]
└── manifest diff:

⮘ seconorth-fngsystem | seco-mx8mp ⮚
├── artifacts.zip size: [ 274.53 MiB → 274.53 MiB ] | -309 B
├── image size: [ 38.2 MiB → 38.2 MiB ]
└── manifest diff:

⮘ seconorth-wayland | seco-genio510 ⮚
├── artifacts.zip size: [ 892.28 MiB → 892.27 MiB ] | -9.39 KiB
├── image size: [ 1.02 GiB → 1.02 GiB ]
└── manifest diff:

--- seconorth-image-seco-genio510-20240702075359.rootfs.manifest
+++ seconorth-image-seco-genio510-20240704134737.rootfs.manifest
-emc-test-suite armv8a 0.0+242+g0500e39
+emc-test-suite armv8a 0.0+243+g83789b1

⮘ seconorth-wayland | seco-genio700 ⮚
├── artifacts.zip size: [ 892.21 MiB → 892.21 MiB ] | -410 B
├── image size: [ 1.02 GiB → 1.02 GiB ]
└── manifest diff:

--- seconorth-image-seco-genio700-20240702075444.rootfs.manifest
+++ seconorth-image-seco-genio700-20240704134240.rootfs.manifest
-emc-test-suite armv8a 0.0+242+g0500e39
+emc-test-suite armv8a 0.0+243+g83789b1

⮘ seconorth-wayland | seco-mx6 ⮚
├── artifacts.zip size: [ 342.20 MiB → 342.20 MiB ] | -659 B
├── image size: [ 332 MiB → 332 MiB ]
└── manifest diff:

--- seconorth-image-seco-mx6-20240702075417.rootfs.manifest
+++ seconorth-image-seco-mx6-20240704134244.rootfs.manifest
-emc-test-suite cortexa9t2hf_neon 0.0+242+g0500e39
+emc-test-suite cortexa9t2hf_neon 0.0+243+g83789b1

⮘ seconorth-wayland | seco-mx6ull ⮚
├── artifacts.zip size: [ 332.33 MiB → 332.33 MiB ] | -3.32 KiB
├── image size: [ 327 MiB → 327 MiB ]
└── manifest diff:

--- seconorth-image-seco-mx6ull-20240702093902.rootfs.manifest
+++ seconorth-image-seco-mx6ull-20240704134259.rootfs.manifest
-emc-test-suite cortexa7t2hf_neon 0.0+242+g0500e39
+emc-test-suite cortexa7t2hf_neon 0.0+243+g83789b1

⮘ seconorth-wayland | seco-mx8mm ⮚
├── artifacts.zip size: [ 520.68 MiB → 520.68 MiB ] | +1.52 KiB
├── image size: [ 377 MiB → 377 MiB ]
└── manifest diff:

--- seconorth-image-seco-mx8mm-20240702075432.rootfs.manifest
+++ seconorth-image-seco-mx8mm-20240704134103.rootfs.manifest
-emc-test-suite seco_mx8mm 0.0+242+g0500e39
+emc-test-suite seco_mx8mm 0.0+243+g83789b1

⮘ seconorth-wayland | seco-mx8mp ⮚
├── artifacts.zip size: [ 523.68 MiB → 523.68 MiB ] | -950 B
├── image size: [ 380 MiB → 380 MiB ]
└── manifest diff:

--- seconorth-image-seco-mx8mp-20240702075423.rootfs.manifest
+++ seconorth-image-seco-mx8mp-20240704134207.rootfs.manifest
-emc-test-suite seco_mx8mp 0.0+242+g0500e39
+emc-test-suite seco_mx8mp 0.0+243+g83789b1

merged

Integration merge request: seco-ne/yocto/manifest!1879 (merged)

mentioned in merge request seco-ne/yocto/manifest!1879 (merged)