RDMA/hw/qib/qib_driver: Fix misspelling in 'ppd's param description

Fixes the following W=1 kernel build warning(s):

 drivers/infiniband/hw/qib/qib_driver.c:165: warning: Function parameter or member 'ppd' not described in 'qib_wait_linkstate'
 drivers/infiniband/hw/qib/qib_driver.c:165: warning: Excess function parameter 'dd' description in 'qib_wait_linkstate'

Link: https://lore.kernel.org/r/20210121094519.2044049-7-lee.jones@linaro.org
Cc: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Cc: Mike Marciniszyn <mike.marciniszyn@cornelisnetworks.com>
Cc: Doug Ledford <dledford@redhat.com>
Cc: Jason Gunthorpe <jgg@ziepe.ca>
Cc: Intel <ibsupport@intel.com>
Cc: linux-rdma@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/qib/qib_driver.c

@@ -151,7 +151,7 @@ int qib_count_units(int *npresentp, int *nupp)
 
 /**
  * qib_wait_linkstate - wait for an IB link state change to occur
- * @dd: the qlogic_ib device
+ * @ppd: the qlogic_ib device
  * @state: the state to wait for
  * @msecs: the number of milliseconds to wait
  *