kbuild: deb-pkg: fix warning when CONFIG_DEBUG_INFO is unset

Creating a Debian package without CONFIG_DEBUG_INFO produces
a warning that no debug package was created.

This patch excludes the debug package from the control file,
if no debug package is created by this configuration.
Signed-off-by: Reinhard Karcher <reinhard.karcher@gmx.net>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>

scripts/package/mkdebian

@@ -198,6 +198,10 @@ Description: Linux support headers for userspace development
  This package provides userspaces headers from the Linux kernel.  These headers
  are used by the installed headers for GNU glibc and other system libraries.
 Multi-Arch: same
+EOF
+
+if is_enabled CONFIG_DEBUG_INFO; then
+cat <<EOF >> debian/control
 
 Package: $dbg_packagename
 Section: debug
@@ -206,6 +210,7 @@ Description: Linux kernel debugging symbols for $version
  This package will come in handy if you need to debug the kernel. It provides
  all the necessary debug symbols for the kernel and its modules.
 EOF
+fi
 
 cat <<EOF > debian/rules
 #!$(command -v $MAKE) -f