DVB-S: set correct SEC_TONE value

DoDiseqc functions turns SEC_TONE_OFF before setting diseqc commands, but forgets
to set the correct SEC_TONE value afterwards. This patch always sets the wanted
SEC_TONE value as determined at the start of this function.

dvb.c

@@ -458,7 +458,7 @@ static int FrontendDoDiseqc(void)
         msleep(100000); /* ... */
     }
 
-    else if ( ioctl( i_frontend, FE_SET_TONE, fe_tone ) < 0 )
+    if ( ioctl( i_frontend, FE_SET_TONE, fe_tone ) < 0 )
     {
         msg_Err( NULL, "FE_SET_TONE failed (%s)", strerror(errno) );
         exit(1);