Fix broken verify functionality in crc32 command

Introduced in change d20a40de9db07de1f1f06a79a4da1cdda5379b75
"Roll crc32 into hash infrastructure"

The crc32 command with no -v expects an optional 3rd argument to be an
address to store the result in. With the -v switch, the last argument
is a crc, not an address. In the case where -v is set, we should set the
HASH_FLAG_ENV flag since that will first look for the value to be a
digest value, which matches the expected API for the crc32 command.

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/cmd_mem.c

@@ -1227,7 +1227,7 @@ static int do_mem_crc(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
 	ac = argc - 1;
 #ifdef CONFIG_HASH_VERIFY
 	if (strcmp(*av, "-v") == 0) {
-		flags |= HASH_FLAG_VERIFY;
+		flags |= HASH_FLAG_VERIFY | HASH_FLAG_ENV;
 		av++;
 		ac--;
 	}