[PATCH 10/10] unpack_loose_rest(): rewrite return handling for clarity

[Jeff King <peff@xxxxxxxx>]

We have a pattern like:

  if (error1)
     ...handle error 1...
  else if (error2)
     ...handle error 2...
  else
     ...return buf...
  ...free buf and return NULL...

This is a little subtle because it is the return in the success block
that lets us skip the common error handling. Rewrite this instead to
free the buffer in each error path, marking it as NULL, and then all
code paths can use the common return.

This should make the logic a bit easier to follow. It does mean
duplicating the buf cleanup for errors, but it's a single line.

Signed-off-by: Jeff King <peff@xxxxxxxx>
---
Obviously could be squashed into the previous one, but I thought the
sequence of diffs made it easier to understand what was being changed.

 object-file.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/object-file.c b/object-file.c
index b7928fb74e..1df8870578 100644
--- a/object-file.c
+++ b/object-file.c
@@ -1437,16 +1437,16 @@ static void *unpack_loose_rest(git_zstream *stream,
 		}
 	}
 
-	if (status != Z_STREAM_END)
+	if (status != Z_STREAM_END) {
 		error(_("corrupt loose object '%s'"), oid_to_hex(oid));
-	else if (stream->avail_in)
+		FREE_AND_NULL(buf);
+	} else if (stream->avail_in) {
 		error(_("garbage at end of loose object '%s'"),
 		      oid_to_hex(oid));
-	else
-		return buf;
+		FREE_AND_NULL(buf);
+	}
 
-	free(buf);
-	return NULL;
+	return buf;
 }
 
 /*
-- 
2.48.1.709.gf47ae731ff