vme: Free DMA resource allocation structure

There is a memory leak in the function vme_dma_free(). The resource
structure allocated in vme_dma_request() needs to be free'd in
vme_dma_free().

Reported-by: De Roo, Steven <steven.deroo@arcelormittal.com>
Signed-off-by: Martyn Welch <martyn.welch@ge.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>