Use calloc instead of malloc&memset

[misdoro]

Some cosmetic changes:

Use calloc(1, sizeof(block)) instead of malloc(sizeof(block)) & memset(ptr, 0, sizeof(block)) They are equivalent and calloc seems to be faster on most systems http://stackoverflow.com/questions/2688466/why-mallocmemset-is-slower-than-calloc for example

[misdoro]

Is there any special reason why malloc + memset pair was used?

[ryanbinns]

Not particularly. Habit, probably...

[ryanbinns]

This broke ttwatchd. The copy_options function was using malloc + memcpy to make a copy of the existing structure, not malloc + memset. Changing this to calloc broke it as it no longer made a copy. I have fixed it again.