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Can I ask why you would need to, I wouldn't have thought you have done anything that goes against the warrant of the card itself, unless it is preformatted with strict instructions telling that it will be void if you re-partition it?
I assume it's just the card you are returning as you have implied and not the phone?
Ahem.. because as far as the supplier needs to know I haven't opened it...
If you have Clockworkmod recovery, you can "Mount USB Storage".
If you look in disk management (right click my comp>manage>Disk management) it shows both partitions, so if you could use gparted, partition magic or paragon etc, you should be able to delete the partition.
In Win 7 I have the option to delete volume which in theroy should allow me to expand the primary partition, however - I dont want to test it.
The best way is to format your SD card using your phone. Settings>SD card and phone storage>Unmount SD card. Once the SD card is unmounted, select Format SD Card. This will format and merge all partitions into a single FAT32 partition