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Fix argument with mismatched bound in isc_iterated_hash()

Michal Nowak requested to merge 2452-iterated_hash-c-warning-argument-1-of-type-unsigned-char-20-with-mismatched-bound into v9_11

GCC 11 produced the following warning:

iterated_hash.c:21:33: warning: argument 1 of type ‘unsigned char[20]’ with mismatched bound [-Warray-parameter=]
   21 | isc_iterated_hash(unsigned char out[ISC_SHA1_DIGESTLENGTH],
      |                   ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from iterated_hash.c:18:
./include/isc/iterated_hash.h:33:37: note: previously declared as ‘unsigned char[155]’
   33 | int isc_iterated_hash(unsigned char out[NSEC3_MAX_HASH_LENGTH],
      |                       ~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~

This unblocks Fedora 34 for ~"v9.11".

Closes #2452 (closed)

Edited by Michal Nowak

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