sha1-array.h: align function arguments

The arguments weren't lined up with the opening parenthesis, after
910650d2 ("Rename sha1_array to oid_array", 2017-03-31) renamed the
function.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/sha1-array.c b/sha1-array.c
index 838b3bf..466a926 100644
--- a/sha1-array.c
+++ b/sha1-array.c
@@ -42,8 +42,8 @@ void oid_array_clear(struct oid_array *array)
 }
 
 int oid_array_for_each_unique(struct oid_array *array,
-				for_each_oid_fn fn,
-				void *data)
+			      for_each_oid_fn fn,
+			      void *data)
 {
 	int i;