[PATCH] builtins + test helpers: use return instead of exit() in cmd_*

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

Change various cmd_* functions to use "return" instead of exit() to
indicate an exit code. On Solaris with SunCC the compiler legitimately
complains about these, since we'll e.g. skip the cleanup (e.g. closing
fd's, erroring if we can't) in git.c's run_builtin() when we exit()
directly like this.

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
---

A trivial issue noticed in my pre-v2.32.0 testing that I wanted to
leave until after the release.

 builtin/difftool.c          | 5 ++---
 builtin/merge-ours.c        | 2 +-
 builtin/mktree.c            | 2 +-
 t/helper/test-hash-speed.c  | 2 +-
 t/helper/test-hash.c        | 2 +-
 t/helper/test-match-trees.c | 2 +-
 t/helper/test-reach.c       | 2 +-
 7 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/builtin/difftool.c b/builtin/difftool.c
index 89334b77fb..6a9242a803 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -675,7 +675,7 @@ static int run_file_diff(int prompt, const char *prefix,
 		"GIT_PAGER=", "GIT_EXTERNAL_DIFF=git-difftool--helper", NULL,
 		NULL
 	};
-	int ret = 0, i;
+	int i;
 
 	if (prompt > 0)
 		env[2] = "GIT_DIFFTOOL_PROMPT=true";
@@ -686,8 +686,7 @@ static int run_file_diff(int prompt, const char *prefix,
 	strvec_push(&args, "diff");
 	for (i = 0; i < argc; i++)
 		strvec_push(&args, argv[i]);
-	ret = run_command_v_opt_cd_env(args.v, RUN_GIT_CMD, prefix, env);
-	exit(ret);
+	return run_command_v_opt_cd_env(args.v, RUN_GIT_CMD, prefix, env);
 }
 
 int cmd_difftool(int argc, const char **argv, const char *prefix)
diff --git a/builtin/merge-ours.c b/builtin/merge-ours.c
index 4594507420..a745c32ae4 100644
--- a/builtin/merge-ours.c
+++ b/builtin/merge-ours.c
@@ -29,5 +29,5 @@ int cmd_merge_ours(int argc, const char **argv, const char *prefix)
 		die_errno("read_cache failed");
 	if (index_differs_from(the_repository, "HEAD", NULL, 0))
 		exit(2);
-	exit(0);
+	return 0;
 }
diff --git a/builtin/mktree.c b/builtin/mktree.c
index 891991b00d..ae78ca1c02 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -189,5 +189,5 @@ int cmd_mktree(int ac, const char **av, const char *prefix)
 		used=0; /* reset tree entry buffer for re-use in batch mode */
 	}
 	strbuf_release(&sb);
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-hash-speed.c b/t/helper/test-hash-speed.c
index 432233c7f0..f40d9ad0c2 100644
--- a/t/helper/test-hash-speed.c
+++ b/t/helper/test-hash-speed.c
@@ -57,5 +57,5 @@ int cmd__hash_speed(int ac, const char **av)
 		free(p);
 	}
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-hash.c b/t/helper/test-hash.c
index 0a31de66f3..261c545b9d 100644
--- a/t/helper/test-hash.c
+++ b/t/helper/test-hash.c
@@ -54,5 +54,5 @@ int cmd_hash_impl(int ac, const char **av, int algo)
 		fwrite(hash, 1, algop->rawsz, stdout);
 	else
 		puts(hash_to_hex_algop(hash, algop));
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-match-trees.c b/t/helper/test-match-trees.c
index b9fd427571..4079fdee06 100644
--- a/t/helper/test-match-trees.c
+++ b/t/helper/test-match-trees.c
@@ -23,5 +23,5 @@ int cmd__match_trees(int ac, const char **av)
 	shift_tree(the_repository, &one->object.oid, &two->object.oid, &shifted, -1);
 	printf("shifted: %s\n", oid_to_hex(&shifted));
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-reach.c b/t/helper/test-reach.c
index cda804ed79..2f65c7f6a5 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -166,5 +166,5 @@ int cmd__reach(int ac, const char **av)
 		print_sorted_commit_ids(list);
 	}
 
-	exit(0);
+	return 0;
 }
-- 
2.32.0.rc3.434.gd8aed1f08a7