agent: Fix length detection of canonical formatted openpgp keys.
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agent: Fix length detection of canonical formatted openpgp keys.

* agent/command.c (cmd_import_key): Pass 0 instead of KEYLEN to
gcry_sexp_canon_len.

We used to pass KEYLEN to the gcry_sexp_canon_len for no good reason:
convert_from_openpgp is guaranteed to return a valid canonical
S-expression and KEYLEN would thus act only as an upper limit. This
is not a problem because usually the original input key is longer than
the returned unprotected key. A future patch may change this
assertion and thus we better fix this bug now.