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ndb/cs: avoid trailing spaces when printing ndb line

--- a/sys/src/cmd/ndb/cs.c

+++ b/sys/src/cmd/ndb/cs.c

@@ -192,12 +192,14 @@

 static int

 ndblinefmt(Fmt *f)

 {

+	char *sep = "";

 	Ndbtuple *t;

 	for(t = va_arg(f->args, Ndbtuple*); t != nil; t = t->entry) {

-		fmtprint(f, "%s=%$ ", t->attr, t->val);

+		fmtprint(f, "%s%s=%$", sep, t->attr, t->val);

 		if(t->line != t->entry)

 			break;

+		sep = " ";

 	}

 	return 0;

 }