Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)

Applying: Replace many memset calls with struct initialization
Using index info to reconstruct a base tree...
M	contrib/pageinspect/btreefuncs.c
M	contrib/pageinspect/ginfuncs.c
M	contrib/pageinspect/gistfuncs.c
M	contrib/pageinspect/heapfuncs.c
M	contrib/pageinspect/rawpage.c
Falling back to patching base and 3-way merge...
Auto-merging contrib/pageinspect/rawpage.c
Auto-merging contrib/pageinspect/heapfuncs.c
Auto-merging contrib/pageinspect/gistfuncs.c
CONFLICT (content): Merge conflict in contrib/pageinspect/gistfuncs.c
Auto-merging contrib/pageinspect/ginfuncs.c
Auto-merging contrib/pageinspect/btreefuncs.c
CONFLICT (content): Merge conflict in contrib/pageinspect/btreefuncs.c
Patch failed at 0001 Replace many memset calls with struct initialization

error: Failed to merge in the changes.
hint: Use 'git am --show-current-patch=diff' to see the failed patch
hint: When you have resolved this problem, run "git am --continue".
hint: If you prefer to skip this patch, run "git am --skip" instead.
hint: To restore the original branch and stop patching, run "git am --abort".
hint: Disable this message with "git config advice.mergeConflict false"