Merge branch 'ab/cmd-foo-should-return'

Code clean-up.

* ab/cmd-foo-should-return:
  builtins + test helpers: use return instead of exit() in cmd_*
diff --git a/builtin/difftool.c b/builtin/difftool.c
index 89334b7..6a9242a 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -675,7 +675,7 @@
 		"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 @@
 	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 4594507..3583cff 100644
--- a/builtin/merge-ours.c
+++ b/builtin/merge-ours.c
@@ -28,6 +28,6 @@
 	if (read_cache() < 0)
 		die_errno("read_cache failed");
 	if (index_differs_from(the_repository, "HEAD", NULL, 0))
-		exit(2);
-	exit(0);
+		return 2;
+	return 0;
 }
diff --git a/builtin/mktree.c b/builtin/mktree.c
index 891991b..ae78ca1 100644
--- a/builtin/mktree.c
+++ b/builtin/mktree.c
@@ -189,5 +189,5 @@
 		used=0; /* reset tree entry buffer for re-use in batch mode */
 	}
 	strbuf_release(&sb);
-	exit(0);
+	return 0;
 }
diff --git a/sh-i18n--envsubst.c b/sh-i18n--envsubst.c
index e7430b9..6cd307a 100644
--- a/sh-i18n--envsubst.c
+++ b/sh-i18n--envsubst.c
@@ -104,12 +104,12 @@
   if (ferror (stderr) || fflush (stderr))
     {
       fclose (stderr);
-      exit (EXIT_FAILURE);
+      return (EXIT_FAILURE);
     }
   if (fclose (stderr) && errno != EBADF)
-    exit (EXIT_FAILURE);
+    return (EXIT_FAILURE);
 
-  exit (EXIT_SUCCESS);
+  return (EXIT_SUCCESS);
 }
 
 /* Parse the string and invoke the callback each time a $VARIABLE or
diff --git a/shell.c b/shell.c
index cef7ffd..811e13b 100644
--- a/shell.c
+++ b/shell.c
@@ -177,7 +177,7 @@
 		default:
 			continue;
 		}
-		exit(cmd->exec(cmd->name, arg));
+		return cmd->exec(cmd->name, arg);
 	}
 
 	cd_to_homedir();
diff --git a/t/helper/test-hash-speed.c b/t/helper/test-hash-speed.c
index 432233c..f40d9ad 100644
--- a/t/helper/test-hash-speed.c
+++ b/t/helper/test-hash-speed.c
@@ -57,5 +57,5 @@
 		free(p);
 	}
 
-	exit(0);
+	return 0;
 }
diff --git a/t/helper/test-hash.c b/t/helper/test-hash.c
index 0a31de6..261c545 100644
--- a/t/helper/test-hash.c
+++ b/t/helper/test-hash.c
@@ -54,5 +54,5 @@
 		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 b9fd427..4079fde 100644
--- a/t/helper/test-match-trees.c
+++ b/t/helper/test-match-trees.c
@@ -23,5 +23,5 @@
 	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 cda804e..2f65c7f 100644
--- a/t/helper/test-reach.c
+++ b/t/helper/test-reach.c
@@ -166,5 +166,5 @@
 		print_sorted_commit_ids(list);
 	}
 
-	exit(0);
+	return 0;
 }