fix(results): check more results before free

Author: quinnj

src/execute.jl

@@ -203,8 +203,9 @@ Base.IteratorSize(::Type{<:TextCursors}) = Base.SizeUnknown()
 function Base.iterate(cursor::TextCursors{buffered}, first=true) where {buffered}
     cursor.cursor.result.ptr == C_NULL && return nothing
     if !first
+        has_more_results = API.moreresults(cursor.cursor.conn.mysql)
         finalize(cursor.cursor.result)
-        if API.moreresults(cursor.cursor.conn.mysql)
+        if has_more_results
             @assert API.nextresult(cursor.cursor.conn.mysql) !== nothing
             cursor.cursor.result = buffered ? API.storeresult(cursor.cursor.conn.mysql) : API.useresult(cursor.cursor.conn.mysql)
             if buffered