[PATCH libnetfilter_queue] src: build: Stop build_man.sh from deleting short Detailed Descriptions

[Duncan Roe <duncan_roe@xxxxxxxxxxxxxxx>]

An empty Detailed Description is 3 lines long but a short (1-para) DD is also 3
lines. Check that the 3rd line really is empty.

Signed-off-by: Duncan Roe <duncan_roe@xxxxxxxxxxxxxxx>
---
 doxygen/build_man.sh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/doxygen/build_man.sh b/doxygen/build_man.sh
index 63e02dc..852c7b8 100755
--- a/doxygen/build_man.sh
+++ b/doxygen/build_man.sh
@@ -116,7 +116,11 @@ del_empty_det_desc(){
   mygrep "^\\.SH \"Detailed Description" $target
   [ $linnum -ne 0  ] || return 0
   [ $(($i - $linnum)) -eq 3 ] || return 0
-  delete_lines $linnum $(($i -1))
+  # A 1-line Detailed Description is also 3 lines long,
+  # but the 3rd line is not empty
+  i=$(($i -1))
+  [ $(tail -n+$i $target | head -n1 | wc -c) -le 2 ] || return 0
+  delete_lines $linnum $i
 }
 
 move_synopsis(){
-- 
2.17.5