RDMA/qib: fix repeated words in comments

Delete the redundant word 'to'.
Signed-off-by: wangjianli <wangjianli@cdjrlc.com>
Link: https://lore.kernel.org/r/20220908132036.42355-1-wangjianli@cdjrlc.comSigned-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/qib/qib_pcie.c

@@ -295,7 +295,7 @@ void qib_free_irq(struct qib_devdata *dd)
  * Setup pcie interrupt stuff again after a reset.  I'd like to just call
  * pci_enable_msi() again for msi, but when I do that,
  * the MSI enable bit doesn't get set in the command word, and
- * we switch to to a different interrupt vector, which is confusing,
+ * we switch to a different interrupt vector, which is confusing,
  * so I instead just do it all inline.  Perhaps somehow can tie this
  * into the PCIe hotplug support at some point
  */