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improve error messages

--- a/query.c

+++ b/query.c

@@ -128,7 +128,7 @@

 {

 	int i, j, n;

 	Hash *h;

-	char *p, *e;

+	char *p, *e, *s;

 	char query[2048];

 	ARGBEGIN{

@@ -139,12 +139,15 @@

 	gitinit();

 	fmtinstall('P', Pfmt);

+	s = "";

 	p = query;

 	e = query + nelem(query);

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

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

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

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

+		s = " ";

+	}

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

-		sysfatal("resolve %s: %r", query);

+		sysfatal("resolve: %r");

 	if(changes){

 		if(n != 2)

 			sysfatal("diff: need 2 commits, got %d", n);