Use calloc properly

Addressing:

/home/jcerny/work/git/openscap/src/source/bz2.c: In function ‘bz2_mem_open’:
/home/jcerny/work/git/openscap/src/source/bz2.c:127:43: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
  127 |         struct bz2_mem *b = calloc(sizeof(struct bz2_mem), 1);
      |                                           ^~~~~~
/home/jcerny/work/git/openscap/src/source/bz2.c:127:43: note: earlier argument should specify number of elements, later size of each element
/home/jcerny/work/git/openscap/src/source/bz2.c:128:35: warning: ‘calloc’ sizes specified with ‘sizeof’ in the earlier argument and not in the later argument [-Wcalloc-transposed-args]
  128 |         b->stream = calloc(sizeof(bz_stream), 1);
      |                                   ^~~~~~~~~
/home/jcerny/work/git/openscap/src/source/bz2.c:128:35: note: earlier argument should specify number of elements, later size of each element

src/source/bz2.c

@@ -124,8 +124,8 @@ static void bz2_mem_free(struct bz2_mem *bzmem)
 
 static struct bz2_mem *bz2_mem_open(const char *buffer, size_t size)
 {
- struct bz2_mem *b = calloc(sizeof(struct bz2_mem), 1);
- b->stream = calloc(sizeof(bz_stream), 1);
+ struct bz2_mem *b = calloc(1, sizeof(struct bz2_mem));
+ b->stream = calloc(1, sizeof(bz_stream));
  // next_in should point at the compressed data
  b->stream->next_in = (char *) buffer;
  // and avail_in should indicate how many bytes the library may read