Missing Argc checks in f4 app_cantest tests

[HorizontalCar]

Hello,

I have been testing automated firmware testing tools on this firmware and found inputs that result in minor crashes. Specifically, there are missing argc checks resulting in null pointer dereferences in the following areas:

lfs
argv[0] can be null resulting in a null pointer dereference in strcmp

oresat-firmware/src/f4/app_cantest/source/test_lfs.c

Line 19 in dff1094

if (!strcmp(argv[0], "ls") && argc > 1) {

time UTC
argv[1] can be null resulting in a null pointer dereference in strcmp

oresat-firmware/src/f4/app_cantest/source/test_time.c

Line 43 in dff1094

if (!strcmp(argv[1], "get")) {

time scet
argv[1] can be null resulting in a null pointer dereference in strcmp

oresat-firmware/src/f4/app_cantest/source/test_time.c

Line 32 in dff1094

if (!strcmp(argv[1], "get")) {

time unix
argv[1] can be null resulting in a null pointer dereference in strcmp

oresat-firmware/src/f4/app_cantest/source/test_time.c

Line 20 in dff1094

if (!strcmp(argv[1], "get")) {