pstore/zone: fix a kernel-doc markup

The documented struct is psz_head and not psz_buffer.
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Link: https://lore.kernel.org/r/a67ca4d12c3ef277dadb9e0d0df8450158e637cc.1610610937.git.mchehab+huawei@kernel.orgSigned-off-by: Jonathan Corbet <corbet@lwn.net>

fs/pstore/zone.c

@@ -23,7 +23,7 @@
 #include "internal.h"
 
 /**
- * struct psz_head - header of zone to flush to storage
+ * struct psz_buffer - header of zone to flush to storage
  *
  * @sig: signature to indicate header (PSZ_SIG xor PSZONE-type value)
  * @datalen: length of data in @data