PVS-Studio warning V512 for Apache

#define MEMSET_BZERO(p,l)       memset((p), 0, (l))

void apr__SHA256_Final(sha2_byte digest[],
                       SHA256_CTX* context) {
  ...
  MEMSET_BZERO(context, sizeof(context));
  ...
}

This is what should have been written here: sizeof(*context)


This suspicious code was found in Apache project by PVS-Studio static code analyzer.
Warning message is:
V512 A call of the 'memset' function will lead to underflow of the buffer '(context)'. apr sha2.c 560

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/