Typo in tput.1

[Sven Joachim]

Debian's lintian tool has caught a missing macro definition in tput.1 as
of the 20180825 patchlevel.

Cheers,
       Sven

diff --git a/man/tput.1 b/man/tput.1
index 62fa9ebc..4346f50a 100644
--- a/man/tput.1
+++ b/man/tput.1
@@ -571,7 +571,7 @@ However that part of X/Open Curses does not follow existing 
practice
 It assigns exit code 4 to \*(``invalid operand\*('',
 which may be the same as \fIunknown capability\fP.
 For instance, the source code for Solaris' xcurses uses the term
-\*(``invalid\*'' in this case.
+\*(``invalid\*('' in this case.
 .bP
 It assigns exit code 255 to a numeric variable that is not specified in
 the terminfo database.