Fix uninitialized variable
echo | awk 'BEGIN {i=$1; print i}' prints a boatload of stack
garbage. NUL terminate the memory returned from malloc to prevent it.
Obtained from: OpenBSD run.c 1.40
Sponsored by: Netflix
Fix %c for floating values that become 0 when coerced to int.
Obtained from: OpenBSD run.c 1.36 (From Jeremy Devenport)
Sponsored by: Netflix, Inc
Don't display empty error context.
Context extraction didn't handle this case and showed uninitialized memory.
Obtained from: OpenBSD lib.c 1.21
Sponsored by: Netflix