Fix for checksum validation patch

Reorder the check for non-BLCKSZ size reads to make sure we don't abort
sending the file in this case.

Missed in the previous commit.

src/backend/replication/basebackup.c

@@ -1409,8 +1409,6 @@ sendFile(const char *readfilename, const char *tarfilename, struct stat *statbuf
 	}
 
 	while ((cnt = fread(buf, 1, Min(sizeof(buf), statbuf->st_size - len), fp)) > 0)
-	{
-		if (verify_checksum)
 	{
 		/*
 		 * The checksums are verified at block level, so we iterate over
@@ -1420,7 +1418,7 @@ sendFile(const char *readfilename, const char *tarfilename, struct stat *statbuf
 		 */
 		Assert(TAR_SEND_SIZE % BLCKSZ == 0);
 
-			if (cnt % BLCKSZ != 0)
+		if (verify_checksum && (cnt % BLCKSZ != 0))
 		{
 			ereport(WARNING,
 					(errmsg("cannot verify checksum in file \"%s\", block "
@@ -1428,8 +1426,10 @@ sendFile(const char *readfilename, const char *tarfilename, struct stat *statbuf
 							"differ",
 							readfilename, blkno, (int) cnt, BLCKSZ)));
 			verify_checksum = false;
-				continue;
 		}
+
+		if (verify_checksum)
+		{
 			for (i = 0; i < cnt / BLCKSZ; i++)
 			{
 				page = buf + BLCKSZ * i;