bug#79567: [PATCH] maint: pacify -Werror=trailing-whitespace

* configure.ac (FORTIFY_SOURCE): Fix indentation.
---
 configure.ac | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

There is code [1] in gnulib that disables this warning for config.h but
it is meant to be temporary and once removed would cause this snippet to
trigger a failure.

[1] https://cgit.git.savannah.gnu.org/cgit/gnulib.git/commit/?id=ff19eeafbee

diff --git a/configure.ac b/configure.ac
index a7432e0a7..8270fe3a3 100644
--- a/configure.ac
+++ b/configure.ac
@@ -221,12 +221,12 @@ if test $gl_gcc_warnings != no; then
 
   AC_DEFINE([lint], [1], [Define to 1 if the compiler is checking for lint.])
   AH_VERBATIM([FORTIFY_SOURCE],
-  [/* Enable compile-time and run-time bounds-checking, and some warnings,
-      without upsetting glibc 2.15+. */
-   #if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
-   # define _FORTIFY_SOURCE 2
-   #endif
-  ])
+[/* Enable compile-time and run-time bounds-checking, and some warnings,
+   without upsetting glibc 2.15+. */
+#if !defined _FORTIFY_SOURCE && defined __OPTIMIZE__ && __OPTIMIZE__
+# define _FORTIFY_SOURCE 2
+#endif
+])
   AC_DEFINE([GNULIB_PORTCHECK], [1], [enable some gnulib portability checks])
 
   # We use a slightly smaller set of warning options for lib/.
-- 
2.51.0