runqemu-extract-sdk: fix install debugfs on rootfs

At least with my current setup and acc. the manual, the images are named
like image-dbg.rootfs.tar.bz2.

The filter has two bugs:
- expects something like -dbg.tar
- tar without compression suffix is not allowed

(From OE-Core rev: e5fb903db308c508fc44bada89fd0210810301a9)

Signed-off-by: Adrian Freihofer <adrian.freihofer@siemens.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/runqemu-extract-sdk

@@ -69,7 +69,7 @@ fi
 pseudo_state_dir="$SDK_ROOTFS_DIR/../$(basename "$SDK_ROOTFS_DIR").pseudo_state"
 pseudo_state_dir="$(readlink -f $pseudo_state_dir)"
 
-debug_image="`echo $ROOTFS_TARBALL | grep '\-dbg\.tar\.'`"
+debug_image="`echo $ROOTFS_TARBALL | grep '\-dbg\.rootfs\.tar'`"
 
 if [ -e "$pseudo_state_dir" -a -z "$debug_image" ]; then
 	echo "Error: $pseudo_state_dir already exists!"