uss: uss_procs.c format-overflow warning
GCC 9 introduced new warnings/errors and is flagging a sprintf with a
format-overflow warning. With --checking-enabled, this error is causing
uss_procs.c to fail during compile.
A file name with the full path is being composed and the size of the
buffer was triggering a possible format-overflow warning/error.
Use asprintf to allocate the buffer dynamically instead of using a
buffer sitting on the stack (reducing the stack requirements by 2K).
Produces new error message if asprintf returns an error.
Change-Id: Ib233052aab9c3bc1ec24dac7e70f97933b478d3e
Reviewed-on: https://gerrit.openafs.org/13664
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>
Tested-by: BuildBot <buildbot@rampaginggeek.com>