module: stats: fix invalid_mod_bytes typo

This was caught by randconfig builds but does not show up in
build testing without CONFIG_MODULE_DECOMPRESS:

kernel/module/stats.c: In function 'mod_stat_bump_invalid':
kernel/module/stats.c:229:42: error: 'invalid_mod_byte' undeclared (first use in this function); did you mean 'invalid_mod_bytes'?
  229 |   atomic_long_add(info->compressed_len, &invalid_mod_byte);
      |                                          ^~~~~~~~~~~~~~~~
      |                                          invalid_mod_bytes

Fixes: df3e764d ("module: add debug stats to help identify memory pressure")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>