[Buildroot] [git commit branch/2022.02.x] package/qemu: fix typo on STAGING_DIR

[Peter Korsgaard]

commit: https://git.buildroot.net/buildroot/commit/?id=e77e79886722aab8923d85ae82e6cfa153c09216
branch: https://git.buildroot.net/buildroot/commit/?id=refs/heads/2022.02.x

Since this commit from 2010:
'87b81bb56f toolchain: move sysroot to host dir'
BR2_STAGING_DIR does not exist anymore.
So fix the typo added in 2014 with commit:
8956c336eb package/qemu: add SDL frontends

Cc: Romain Naour <romain.naour at gmail.com>
Signed-off-by: Ricardo Martincoski <ricardo.martincoski at gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni at bootlin.com>
(cherry picked from commit 1830d009cabc62ed2a34369704ad3db254eed148)
Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 package/qemu/qemu.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/package/qemu/qemu.mk b/package/qemu/qemu.mk
index 33e6938774..8f95ea0362 100644
--- a/package/qemu/qemu.mk
+++ b/package/qemu/qemu.mk
@@ -72,7 +72,7 @@ endif
 ifeq ($(BR2_PACKAGE_QEMU_SDL),y)
 QEMU_OPTS += --enable-sdl
 QEMU_DEPENDENCIES += sdl2
-QEMU_VARS += SDL2_CONFIG=$(BR2_STAGING_DIR)/usr/bin/sdl2-config
+QEMU_VARS += SDL2_CONFIG=$(STAGING_DIR)/usr/bin/sdl2-config
 else
 QEMU_OPTS += --disable-sdl
 endif