panic generation update

panic generation update

something weird, e.g.
panic(cpu 0 caller 0x5c91c3d0): buf@/Users/shadow/Source/openafs/src/rx/rx_kcommon.c:1348

which came from an osi_Assert. not sure yet what the deal is, but attempt to
make this less ambiguous and less likely to conflict with other macros.

Change-Id: Iac27e89fc655d2b1ba6d04936e137060d8abd9c4
Reviewed-on: http://gerrit.openafs.org/1693
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>