staging: r8188eu: Fix misspelling in comment "cacluated" -> "calculated"

This patch fixes some spelling typo in error message reported by
checkpatch.pl

WARNING: 'cacluated' may be misspelled - perhaps 'calculated'?

Signed-off-by: 白浩文 <baihaowen@meizu.com>
Link: https://lore.kernel.org/r/1648809881-2777-1-git-send-email-baihaowen@meizu.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>