new warnings in build with pkinit code

[Ken Raeburn]

lib/krb5/asn.1/asn1_k_decode.c: In function  
'asn1_decode_algorithm_identifier':
lib/krb5/asn.1/asn1_k_decode.c:1346: warning: 'asn1class' is used  
uninitialized in this function
lib/krb5/asn.1/asn1_k_decode.c:1346: warning: 'tagnum' is used  
uninitialized in this function
lib/krb5/asn.1/asn1_k_decode.c:1346: warning: 'indef' is used  
uninitialized in this function

It looks to me like these values will control how the processing is  
done at the end of the structure (e.g., whether to look for the tail  
end of an indefinite encoding), so leaving them uninitialized is a  
bad idea.

Ken