Added workaround to the helper script for the rhbz#1926687

Signed-off-by: Jaroslav Škarvada <jskarvad@redhat.com>

clean_patent_problems.sh

@@ -10,8 +10,8 @@ PROBLEMS=(
 	'gr-atsc'
 )
 
-# Indicate the source
-URL=$(spectool -S -l ./gnuradio.spec | sed -E 's/Source0:\s+//g')
+# Indicate the source (including workaround for rhbz#1926687)
+URL=$(spectool -S -l ./gnuradio.spec | sed -nE '/^\s*Source/ s/Source0:\s+//g;p')
 
 # Meta variables
 SOURCE=$(basename $URL)