Fix harmless compiler warning.

FossilOrigin-Name: 3286e1a07b0693049a07f0865bf93749c461ea8f6d1175ec2d1642886673d8ac
diff --git a/src/main.c b/src/main.c
index 0337ab7..2d81358 100644
--- a/src/main.c
+++ b/src/main.c
@@ -824,7 +824,7 @@
         if( aFlagOp[i].op==op ){
           int onoff = va_arg(ap, int);
           int *pRes = va_arg(ap, int*);
-          int oldFlags = db->flags;
+          u32 oldFlags = db->flags;
           if( onoff>0 ){
             db->flags |= aFlagOp[i].mask;
           }else if( onoff==0 ){