t1003-read-tree-prefix.sh: use the $( ... ) construct for command substitution

diff --git a/commit.h b/commit.h
index 16d9c4351395ac55d6856d8d92d24ce7064df974..55631f191f2a01276e8a16192117fb3cf25bc958 100644 (file)
--- a/commit.h
+++ b/commit.h
@@ -209,7 +209,7 @@ extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
 extern void setup_alternate_shallow(struct lock_file *shallow_lock,
                                    const char **alternate_shallow_file,
                                    const struct sha1_array *extra);
-extern char *setup_temporary_shallow(const struct sha1_array *extra);
+extern const char *setup_temporary_shallow(const struct sha1_array *extra);
 extern void advertise_shallow_grafts(int);
 
 struct shallow_info {