This fixes some issues in the dvb subsystem and some nasty things in the
v4l saa7146 driver.

[DVB]
 - dvb-core: aquire -> acquire spelling fix
 - nxt600 frontend: don't send zero-byte messages when probing the PLL
   type
 - Kconfig: add a note that says that the CI of the budget-CI card is
   not actually supported by the budget-CI driver
 - ttusb-dec: Check for presence of crc32 function.  Make unknown types
   of packet less likely to cause packet loss.

[V4L]
 - saa7146: use kernel mint_t()/max_t() instead of homebrewn stuff
 - saa7146: disable video clipping before capturing for sure to prevent
   black pictures
 - saa7146: make sure to disable the right video dma upon device close
 - saa7146: don't free resources if disabling an already disabled video
   overlay