Indentation fix

[Bruno Haible]

2021-12-15  Bruno Haible  <bruno@clisp.org>

        Indentation fix.
        * m4/include_next.m4 (gl_NEXT_HEADERS_INTERNAL): Correct indentation.

diff --git a/m4/include_next.m4 b/m4/include_next.m4
index bdd542bc6..7dcd1cef0 100644
--- a/m4/include_next.m4
+++ b/m4/include_next.m4
@@ -193,9 +193,9 @@ AC_DEFUN([gl_NEXT_HEADERS_INTERNAL],
              if test AS_VAR_GET([gl_header_exists]) = yes; then
              AS_VAR_POPDEF([gl_header_exists])
             ])
-           gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME)
-           AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME))
-           AS_VAR_SET([gl_next_header], ['"'$gl_header'"'])
+          gl_ABSOLUTE_HEADER_ONE(gl_HEADER_NAME)
+          AS_VAR_COPY([gl_header], [gl_cv_absolute_]AS_TR_SH(gl_HEADER_NAME))
+          AS_VAR_SET([gl_next_header], ['"'$gl_header'"'])
           m4_if([$2], [check],
             [else
                AS_VAR_SET([gl_next_header], ['<'gl_HEADER_NAME'>'])