[PATCH RESEND 2/2] ovl: free lower_mnt array in ovl_put_super

This fixes memory leak after umount. Kmemleak report: unreferenced object 0x8800ba791010 (size 8): comm "mount", pid 2394, jiffies 4294996294 (age 53.920s) hex dump (first 8 bytes): 20 1c 13 02 00 88 ff ff ... backtrace: []

[PATCH RESEND 2/2] ovl: free lower_mnt array in ovl_put_super

This fixes memory leak after umount. Kmemleak report: unreferenced object 0x8800ba791010 (size 8): comm mount, pid 2394, jiffies 4294996294 (age 53.920s) hex dump (first 8 bytes): 20 1c 13 02 00 88 ff ff ... backtrace: [811f8cd4]