Always initialize xpparam_t to 0

We're going to be adding some parameters to this, so we can't have
any uninitialized data in it.

Signed-off-by: Brian Downing <bdowning@lavos.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

builtin-blame.c

@@ -523,6 +523,7 @@ static struct patch *compare_buffer(mmfile_t *file_p, mmfile_t *file_o,
 	xdemitconf_t xecfg;
 	xdemitcb_t ecb;
 
+	memset(&xpp, 0, sizeof(xpp));
 	xpp.flags = xdl_opts;
 	memset(&xecfg, 0, sizeof(xecfg));
 	xecfg.ctxlen = context;