gnulib/argp-help: Fix dereference of a possibly NULL state

All other instances of call to __argp_failure() where there is
a dgettext() call is first checking whether state is NULL before
attempting to dereference it to get the root_argp->argp_domain.

Fixes: CID 292436

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>

bootstrap.conf

@@ -79,7 +79,7 @@ cp -a INSTALL INSTALL.grub
 
 bootstrap_post_import_hook () {
   set -e
-  for patchname in fix-base64 fix-null-deref fix-uninit-structure fix-unused-value fix-width no-abort; do
+  for patchname in fix-base64 fix-null-deref fix-null-state-deref fix-uninit-structure fix-unused-value fix-width no-abort; do
     patch -d grub-core/lib/gnulib -p2 \
       < "grub-core/lib/gnulib-patches/$patchname.patch"
   done

conf/Makefile.extra-dist

@@ -30,6 +30,7 @@ EXTRA_DIST += grub-core/genemuinitheader.sh
 
 EXTRA_DIST += grub-core/lib/gnulib-patches/fix-base64.patch
 EXTRA_DIST += grub-core/lib/gnulib-patches/fix-null-deref.patch
+EXTRA_DIST += grub-core/lib/gnulib-patches/fix-null-state-deref.patch
 EXTRA_DIST += grub-core/lib/gnulib-patches/fix-uninit-structure.patch
 EXTRA_DIST += grub-core/lib/gnulib-patches/fix-unused-value.patch
 EXTRA_DIST += grub-core/lib/gnulib-patches/fix-width.patch

grub-core/lib/gnulib-patches/fix-null-state-deref.patch

@@ -0,0 +1,12 @@
+--- a/lib/argp-help.c	2020-10-28 14:32:19.189215988 +0000
++++ b/lib/argp-help.c	2020-10-28 14:38:21.204673940 +0000
+@@ -145,7 +145,8 @@
+       if (*(int *)((char *)upptr + up->uparams_offs) >= upptr->rmargin)
+         {
+           __argp_failure (state, 0, 0,
+-                          dgettext (state->root_argp->argp_domain,
++                          dgettext (state == NULL ? NULL
++                                    : state->root_argp->argp_domain,
+                                     "\
+ ARGP_HELP_FMT: %s value is less than or equal to %s"),
+                           "rmargin", up->name);