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Avoid print type letters in emitbin()

If there is no letter for the operator it means that is a non
sense to print the type of the node.

--- a/cc1/code.c

+++ b/cc1/code.c

@@ -307,9 +307,10 @@

 	emitnode(np->left);

 	emitnode(np->right);

-	if ((s = optxt[op]) != NULL)        /* do not print in OCOLON case */

+	if ((s = optxt[op]) != NULL)  {      /* do not print in OCOLON case */

 		printf("\t%s", optxt[op]);

-	emitletter(np->type);

+		emitletter(np->type);

+	}

 }

 static void