Reallocation does not set new memory area to zero

[wusto]

From realloc man page:
"If the new size is larger than the old size, the added memory will not be initialized."

groupcheck/groupcheck.c

Line 839 in 3a6c336

data = realloc(data, sizeof(struct line_data)*line_data_buf);

As the first call is to calloc, this might lead to false assumptions when accessing the memory.

A possible solution is to memset the data buffer after realloc.