RDMA/qib: Remove all occurrences of BUG_ON()

QIB driver was added in 2010 with many BUG_ON(), most of them were cleaned
out after years of development and usages.

It looks like that it is safe now to remove rest of BUG_ONs.

Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Acked-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

drivers/infiniband/hw/qib/qib_iba6120.c

@@ -3237,7 +3237,6 @@ static int init_6120_variables(struct qib_devdata *dd)
 	/* we always allocate at least 2048 bytes for eager buffers */
 	ret = ib_mtu_enum_to_int(qib_ibmtu);
 	dd->rcvegrbufsize = ret != -1 ? max(ret, 2048) : QIB_DEFAULT_MTU;
-	BUG_ON(!is_power_of_2(dd->rcvegrbufsize));
 	dd->rcvegrbufsize_shift = ilog2(dd->rcvegrbufsize);
 
 	qib_6120_tidtemplate(dd);