Properly initialize kyua_tap_summary_t

As I didn't write an initialization function for this data type (bad
me), all locations instantiating it must be careful to file in all
details correctly.  Do so now.

This fixes breakage observed in NetBSD.

tap_parser_test.c

@@ -101,8 +101,9 @@ ATF_TC_BODY(parse__ok__pass, tc)
         "garbage line\n"
         "ok - 3 This test passed\n";
 
-    kyua_tap_summary_t summary;
+    kyua_tap_summary_t summary; memset(&summary, 0, sizeof(summary));
     summary.parse_error = NULL;
+    summary.bail_out = false;
     summary.first_index = 1;
     summary.last_index = 3;
     summary.ok_count = 3;
@@ -124,8 +125,9 @@ ATF_TC_BODY(parse__ok__fail, tc)
         "not ok - 4 This test failed\n"
         "ok - 5 This test passed\n";
 
-    kyua_tap_summary_t summary;
+    kyua_tap_summary_t summary; memset(&summary, 0, sizeof(summary));
     summary.parse_error = NULL;
+    summary.bail_out = false;
     summary.first_index = 1;
     summary.last_index = 5;
     summary.ok_count = 2;