lbutils: strict string functions - abort on err

on the conditions where these functions encounter
an unexpected error, we currently return -1

this means that the caller must check. which means
the caller won't check. nobody does. i often forget.

force the caller (me) to be correct, instead.

the current calling convention is that the real
return value is stored in a pointer, provided inside
the function signature, on a given string function,
and the function's return value is merely an indicator.

this calling convention is retained for now; the next
patch will change it, such that the real value is also
the function's return value. this is more flexible.

Signed-off-by: Leah Rowe <leah@libreboot.org>

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