Re: [RFC PATCH 2/3] usage: prefix all lines in `vreportf()`, not just the first

diff --git a/t/t1011-read-tree-sparse-checkout.sh b/t/t1011-read-tree-sparse-checkout.sh
index 0c6f48f302..31b0702e6c 100755
--- a/t/t1011-read-tree-sparse-checkout.sh
+++ b/t/t1011-read-tree-sparse-checkout.sh

@@ -243,9 +243,9 @@ test_expect_success 'print errors when failed to update worktree' '
 	test_must_fail git checkout top 2>actual &&
 	cat >expected <<\EOF &&
 error: The following untracked working tree files would be overwritten by checkout:
-	sub/added
-	sub/addedtoo
-Please move or remove them before you switch branches.
+error: 	sub/added
+error: 	sub/addedtoo
+error: Please move or remove them before you switch branches.
 Aborting
 EOF

diff --git a/t/t1506-rev-parse-diagnosis.sh b/t/t1506-rev-parse-diagnosis.sh
index 4ee009da66..80d35087b7 100755
--- a/t/t1506-rev-parse-diagnosis.sh
+++ b/t/t1506-rev-parse-diagnosis.sh

@@ -11,7 +11,7 @@ test_did_you_mean ()
 	sq="'" &&
 	cat >expected <<-EOF &&
 	fatal: Path '$2$3' $4, but not ${5:-$sq$3$sq}.
-	Did you mean '$1:$2$3'${2:+ aka $sq$1:./$3$sq}?
+	fatal: Did you mean '$1:$2$3'${2:+ aka $sq$1:./$3$sq}?
 	EOF

diff --git a/usage.c b/usage.c
index 80f9c1d14b..6a5669922f 100644
--- a/usage.c
+++ b/usage.c

@@ -34,7 +34,7 @@ void vreportf(const char *prefix, const char *err, va_list params)
 		if (iscntrl(*p) && *p != '\t' && *p != '\n')
 			*p = '?';
 	}
-	fprintf(stderr, "%s%s\n", prefix, msg);
+	prefix_suffix_lines(stderr, prefix, msg, "");
 }