checksum_impl.h fails cpluspluscheck

./src/include/storage/checksum_impl.h: In function ‘uint32 pg_checksum_block(char*, uint32)’:
./src/include/storage/checksum_impl.h:154: warning: comparison between signed and unsigned integer expressions

We could exclude that file from the check, but it's also easy to fix by
making the variables unsigned:

diff --git a/src/include/storage/checksum_impl.h b/src/include/storage/checksum_impl.h
index ce1b124..7987b04 100644
--- a/src/include/storage/checksum_impl.h
+++ b/src/include/storage/checksum_impl.h
@@ -141,7 +141,7 @@ pg_checksum_block(char *data, uint32 size)
uint32 sums[N_SUMS];
uint32 (*dataArr)[N_SUMS] = (uint32 (*)[N_SUMS]) data;
uint32 result = 0;
- int i,
+ unsigned int i,
j;

/* ensure that the size is compatible with the algorithm */

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