[Backport 2.28] Fix incorrect dispatch to USAGE in example programs, which causes uninitialized memory to be used

[aditya-deshpande-arm]

Description

Fixes issues #1120 and #6700.

Numerous example programs contain the following:

if (argc == 0) {
    goto USAGE;
}

// later in program
p = argv[1];

If a program is called from the shell thenargc = 1, so the program will not go to USAGE due to the check. The access to argv[1] is accessing undefined memory. This PR changes the check to if (argc < 2).

Gatekeeper checklist

• changelog provided
• backport of Fix incorrect dispatch to USAGE in example programs, which causes uninitialized memory to be used #6998
• tests not required, example programs

[daverodgman]

LGTM

[tom-cosgrove-arm]

LGTM