[PATCH libnetfilter_queue] build: add missing backslash to build_man.sh

[Duncan Roe <duncan_roe@xxxxxxxxxxxxxxx>]

Search for exact match of ".RI" had a '\' to escape '.' from the regexp
parser but was missing another '\' to escape the 1st '\' from shell.
Had not yet caused a problem but might as well do things correctly.

Fixes: 6d17e6daa175
Signed-off-by: Duncan Roe <duncan_roe@xxxxxxxxxxxxxxx>
---
 doxygen/build_man.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/doxygen/build_man.sh b/doxygen/build_man.sh
index c0124e2..8f1852a 100755
--- a/doxygen/build_man.sh
+++ b/doxygen/build_man.sh
@@ -43,7 +43,7 @@ rename_real_pages(){
   do
     j=$(ed -s $i <<////
 /Functions/+1;.#
-/^\.RI/;.#
+/^\\.RI/;.#
 .,.s/^.*\\\\fB//
 .,.s/\\\\.*//
 .,.w /dev/stdout
-- 
2.39.4