reiserfs: Replace kmalloc with kcalloc in the comment

Use kcalloc instead of kmalloc in the comment according to
the previous kcalloc() call.

Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Liao Pingfang <[email protected]>
Signed-off-by: Jan Kara <[email protected]>
1 file changed