media: dvb: do some coding style cleanup

Fix a bunch of coding style issues found by checkpatch on the
part of the code that the previous patches touched.

WARNING: please, no space before tabs
+ * ^I^Icallback.$

ERROR: space required before the open parenthesis '('
+	switch(cmd) {

WARNING: line over 80 characters
+			err = dtv_property_process_get(fe, &getp, tvp + i, file);

WARNING: line over 80 characters
+			err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);

ERROR: "(foo*)" should be "(foo *)"
+			err = fe->ops.diseqc_recv_slave_reply(fe, (struct dvb_diseqc_slave_reply*) parg);

WARNING: line over 80 characters
+				err = fe->ops.read_signal_strength(fe, (__u16 *) parg);

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>