Remove unreachable code.  Fix a shift UB problem introduced yesterday
and discovered by OSSFuzz.

FossilOrigin-Name: 078dbff04a95a001bbd8690ab08038fbb5506899df8290991b53fd1122a4c30c
diff --git a/src/trigger.c b/src/trigger.c
index 0893f79..4f4bf9a 100644
--- a/src/trigger.c
+++ b/src/trigger.c
@@ -862,7 +862,7 @@
       }
     }
   }
-  if( !db->mallocFailed && !pParse->colNamesSet ){
+  if( !db->mallocFailed ){
     Vdbe *v = pParse->pVdbe;
     assert( v!=0 );
     sqlite3VdbeSetNumCols(v, pNew->nExpr);