process-debuginfo: Better search for vmlinux

Find first file, in any dir name, three levels max from $RPM_BUILD_DIR.

Fix incompatibility found by building ovz kernel.

scripts/process-debuginfo.in

@@ -31,7 +31,7 @@ elif [ -z "${f#./lib/modules/*.ko.[gx]z}" ]; then
 elif [ -z "${f##./boot/vmlinuz-*}" ]; then
 	# Compressed kernel: trigger extraction of vmlinux from the source.
 	kver=${f#./boot/vmlinuz-}
-	vmlinuxs=$(set +f; ls "$RPM_BUILD_DIR"/kernel-image-*/kernel-source-*/vmlinux)
+	vmlinuxs=$(find "$RPM_BUILD_DIR" -depth -maxdepth 3 -type f -name vmlinux -print -quit)
 	vmlinuxd=./usr/lib/debug/lib/modules/$kver/vmlinux
 
 	if [ -f "$vmlinuxs" ]; then
@@ -39,6 +39,7 @@ elif [ -z "${f##./boot/vmlinuz-*}" ]; then
 		f=$vmlinuxd
 	else
 		echo "Warning: vmlinux not found for -debuginfo" >&2
+		exit
 	fi
 fi