dvb/si/tdt: Fix tdt_get_utc() function.
dvb/si/tdt: Fix tdt_get_utc() function.

Due to missing casts the function is not returning correctly the top
8 bits (32-40) of UTC_time field.

kgmoore/bitstream,svogl/bitstream,kierank/bitstream,avble/bitstream,hiroshiyui/bitstream,gfto/bitstream,hiroshiyui/bitstream,avble/bitstream,theambient/bitstream_c,hiroshiyui/bitstream,theambient/bitstream_c,kierank/bitstream,svogl/bitstream,gfto/bitstream,kgmoore/bitstream,avble/bitstream,svogl/bitstream,kgmoore/bitstream