RDMA/erdma: Fix a typo in annotation

A non-ASCII character was wrongly put in a comment, use the ACSII version.

Fixes: bee85e0e ("RDMA/erdma: Add main include file")
Link: https://lore.kernel.org/r/20221124114933.77250-1-chengyou@linux.alibaba.com


Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>