promisor-remote: fix xcalloc() argument order

Pass the number of elements first and their size second, as expected
by xcalloc().

Patch generated with:

  make SPATCH_FLAGS=--recursive-includes contrib/coccinelle/xcalloc.cocci.patch

Our default SPATCH_FLAGS ('--all-includes') doesn't catch this
transformation by default, unless used in combination with a large-ish
SPATCH_BATCH_SIZE which happens to put 'promisor-remote.c' with a file
that includes 'repository.h' directly in the same batch.

Signed-off-by: SZEDER Gábor <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: szeder

promisor-remote.c

@@ -146,7 +146,7 @@ static void promisor_remote_init(struct repository *r)
 	if (r->promisor_remote_config)
 		return;
 	config = r->promisor_remote_config =
-		xcalloc(sizeof(*r->promisor_remote_config), 1);
+		xcalloc(1, sizeof(*r->promisor_remote_config));
 	config->promisors_tail = &config->promisors;
 
 	repo_config(r, promisor_remote_config, config);