• Do not malloc buffer for 0-size member when reading from archive.
• Fix a malloc buffer overrun: Use a while loop to check whether the string buffer is big enough after resizing, since doubling once might not be enough when a very long member name or symbol name is provided.
• Fix typo.

Reported by: Michael Plass <mfp49_freebsd@plass-family.net>
Tested by: Michael Plass <mfp49_freebsd@plass-family.net>
Reviewed by: jkoshy
Approved by: jkoshy