mountd: Make local functions static

mountd: Make local functions static

Removed a couple Wmissing-prototypes warnings in the mountd code.

Once the parse_fsid() function was made static, the compiler
detected execution paths through it that did not initialize some
fields in *parsed.

[ I'm pretty sure these problems are currently harmless, since each
path is taken depending on the value of the .fsidtype field.  Each
path accesses only the fields in *parsed that it cares about. ]

This is because parsed_fsid isn't a union type.  parse_fsid() leaves
uninitialized fields that are not used by a particular fsidtype.  To
prevent an accidental dereference of stack garbage (.fhuuid being an
example of a pointer that is left uninitialized sometimes), have
parse_fsid() defensively pre-initialize *parsed to zero.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Steve Dickson <steved@redhat.com>