lefRead.c: LefError() add ASSERT(type) for incorrect caller usage

'type' maybe used as array index without being initialized.

Sonarcloud
Array subscript is undefined
https://sonarcloud.io/project/issues?open=AZJB17LDNGfDNup0Rjyn&id=dlmiles_magic

lef/lefRead.c

@@ -349,6 +349,10 @@ LefError(int type, char *fmt, ...)
 	    mode = 1;
 	    level = -1;
 	    break;
+	default:
+	    ASSERT(FALSE, "type");
+	    return;
+	    break;
     }
     lefdeftype = lefdeftypes[mode];