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ndb/query: avoid trailing spaces when printing ndb line structure

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

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

@@ -52,12 +52,15 @@

 			}

 		}

 	} else {

+		char *sep = "";

+

 		for(; nt != nil; nt = nt->entry){

 			if(match(nt->attr, rattr, nrattr)){

-				Bprint(&bout, "%s=%$ ", nt->attr, nt->val);

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

-					Bprint(&bout, "\n\t");

+				Bprint(&bout, "%s%s=%$", sep, nt->attr, nt->val);

+				sep = " ";

 			}

+			if(nt->entry != nt->line)

+				sep = "\n\t";

 		}

 		Bprint(&bout, "\n");

 	}

-- 

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