On macOS High Sierra (10.13), Apple's `clang`[1] complains about missing
braces around initialization of a subobject, which is problematic when
building with `DEVELOPER=YesPlease` which enables `-Werror`:

    builtin/unpack-objects.c:388:26: error: suggest braces around
        initialization of subobject [-Werror,-Wmissing-braces]
            git_zstream zstream = { 0 };

[1]: `cc --version` => "Apple LLVM version 10.0.0 (clang-1000.10.44.4)"

Signed-off-by: Eric Sunshine <redacted>
---

Notes:
    This is atop 'hx/unpack-streaming' which is already in 'next'.
    All the CI builds are fine with this change.

    As I understand it, this should be a safe change; the fields which
    follow `z_stream z` in `git_zstream` will be initialized to zero
    since the first field has an explicit initializer.

 builtin/unpack-objects.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/builtin/unpack-objects.c b/builtin/unpack-objects.c
index 43789b8ef2..c606c92e37 100644
--- a/builtin/unpack-objects.c
+++ b/builtin/unpack-objects.c

@@ -385,7 +385,7 @@ static const void *feed_input_zstream(struct input_stream *in_stream,
 
 static void stream_blob(unsigned long size, unsigned nr)
 {
-	git_zstream zstream = { 0 };
+	git_zstream zstream = {{ 0 }};
 	struct input_zstream_data data = { 0 };
 	struct input_stream in_stream = {
 		.read = feed_input_zstream,

-- 
2.37.0.236.gcef32db0b6.dirty