ham/rtl-sdr: Fix whitespaces.

Signed-off-by: Willy Sudiarto Raharjo <willysr@slackbuilds.org>

ham/rtl-sdr/slack-desc

@@ -9,11 +9,11 @@
 rtl-sdr: rtl-sdr (inexpensive USB software defined receiver)
 rtl-sdr:
 rtl-sdr: turns your Realtek RTL2832 based DVB dongle into a SDR receiver
-rtl-sdr: DVB-T dongles based on the Realtek RTL2832U can be used as a cheap 
-rtl-sdr: SDR since the chip allows transferring the raw I/Q samples to the 
+rtl-sdr: DVB-T dongles based on the Realtek RTL2832U can be used as a cheap
+rtl-sdr: SDR since the chip allows transferring the raw I/Q samples to the
 rtl-sdr: host which is officially used for DAB/DAB+/FM demodulation
-rtl-sdr: 
+rtl-sdr:
 rtl-sdr: homepage: http://sdr.osmocom.org/trac/wiki/rtl-sdr
-rtl-sdr: 
 rtl-sdr:
-rtl-sdr: 
+rtl-sdr:
+rtl-sdr: