Check for error returns from inflateInit()

At present, it is sufficient to ensure that an error return
from inflateInit() is not ignored. Most error returns, like
Z_VERSION_ERROR and Z_STREAM_ERROR, indicate programming or
build errors. These errors could, perhaps, be handled with
simple asserts. However, for a Z_MEM_ERROR, we may want to
perform some further error handling in the future.

Signed-off-by: Ramsay Jones <ramsay@ramsay1.demon.co.uk>
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

src/odb.c

@@ -310,9 +310,14 @@ static void set_stream_output(z_stream *s, void *out, size_t len)
 
 static int start_inflate(z_stream *s, gitfo_buf *obj, void *out, size_t len)
 {
+	int status;
+
 	init_stream(s, out, len);
 	set_stream_input(s, obj->data, obj->len);
-	inflateInit(s);
+
+	if ((status = inflateInit(s)) < Z_OK)
+		return status;
+
 	return inflate(s, 0);
 }
 
@@ -377,7 +382,8 @@ static int inflate_buffer(void *in, size_t inlen, void *out, size_t outlen)
 	init_stream(&zs, out, outlen);
 	set_stream_input(&zs, in, inlen);
 
-	inflateInit(&zs);
+	if (inflateInit(&zs) < Z_OK)
+		return GIT_ERROR;
 
 	while (status == Z_OK)
 		status = inflate(&zs, Z_FINISH);