patch for 5.10.stable (sound/oss/dmasound)

Please apply

commit 9dd7c46346ca Author: Randy Dunlap rdunlap@infradead.org Date: Tue Apr 5 16:41:18 2022 -0700

sound/oss/dmasound: fix build when drivers are mixed =y/=m

to the 5.10 stable tree. The kernel test robot lkp@intel.com reported a build error on 5.10.y and this patch fixes the build error.