fix compiler warning
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@ -127,7 +127,7 @@ static VALUE rb_mysql_result_fetch_row(VALUE self, ID db_timezone, ID app_timezo
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for (i = 0; i < wrapper->numberOfFields; i++) {
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VALUE field = rb_mysql_result_fetch_field(self, i, symbolizeKeys);
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if (row[i]) {
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VALUE val;
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VALUE val = Qnil;
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switch(fields[i].type) {
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case MYSQL_TYPE_NULL: // NULL-type field
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val = Qnil;
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