free_irq() may be called to free an interrupt that was not
allocated.  Add missing 'if' statement to check for
exclusive_vectors when freeing interrupt 1.

Fixes: cc68f217 ("VMCI: dma dg: register dummy IRQ handlers for DMA datagrams")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Bryan Tan <bryantan@vmware.com>
Reviewed-by: Rajesh Jalisatgi <rjalisatgi@vmware.com>
Signed-off-by: Vishnu Dasa <vdasa@vmware.com>
Link: https://lore.kernel.org/r/20220318055843.30606-1-vdasa@vmware.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>