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git/query: check for nil return from seprint

--- a/sys/src/cmd/git/query.c

+++ b/sys/src/cmd/git/query.c

@@ -180,7 +180,8 @@

 	p = query;

 	e = query + nelem(query);

 	for(i = 0; i < argc; i++){

-		p = seprint(p, e, "%s%s", s, argv[i]);

+		if((p = seprint(p, e, "%s%s", s, argv[i])) == nil)

+			sysfatal("query too long");

 		s = " ";

 	}

 	if((n = resolverefs(&h, query)) == -1)