configure: Fix SDL2 typo by referencing value

During configuration of SDL2, variable enable_grub_emu_sdl2 is checked
whether to throw an error message. However, error could not happen
because two unequal strings were compared. Fix this by referencing
value of enable_grub_emu_sdl2, not name.

Fixes: 17d6ac1a7 (emu: Add SDL2 support)
Signed-off-by: Michał Grzelak <mchl.grzlk@gmail.com>
Reviewed-by: Julian Andres Klode <julian.klode@canonical.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>

diff --git a/configure.ac b/configure.ac
index 01500ffdf31992eb9cc9b39567b5e210ee8a0a42..27c5918faa1000732354f78cea26978682cb2da0 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -1609,7 +1609,7 @@ if test "$platform" = emu; then
             AC_SUBST(HAVE_SDL2)],
             [grub_emu_sdl2_excuse="libSDL2 libraries are required to build \`grub-emu' with SDL2 support"])
   [fi]
-  if test x"enable_grub_emu_sdl2" = xyes && test x"$grub_emu_sdl2_excuse" != x ; then
+  if test x"$enable_grub_emu_sdl2" = xyes && test x"$grub_emu_sdl2_excuse" != x ; then
     AC_MSG_ERROR([SDL2 support for grub-emu was explicitly requested but can't be compiled ($grub_emu_sdl2_excuse)])
   fi
   if test x"$grub_emu_sdl2_excuse" = x ; then