qemu-io-cmds: Fix two format strings

Use %zu instead of %zd for unsigned numbers.

This fixes two error messages from the LSTM static code analyzer:

    This argument should be of type 'ssize_t' but is of type 'unsigned long'

Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

qemu-io-cmds.c

@@ -907,7 +907,7 @@ static int readv_f(BlockBackend *blk, int argc, char **argv)
         memset(cmp_buf, pattern, qiov.size);
         if (memcmp(buf, cmp_buf, qiov.size)) {
             printf("Pattern verification failed at offset %"
-                   PRId64 ", %zd bytes\n", offset, qiov.size);
+                   PRId64 ", %zu bytes\n", offset, qiov.size);
             ret = -EINVAL;
         }
         g_free(cmp_buf);
@@ -1294,7 +1294,7 @@ static void aio_read_done(void *opaque, int ret)
         memset(cmp_buf, ctx->pattern, ctx->qiov.size);
         if (memcmp(ctx->buf, cmp_buf, ctx->qiov.size)) {
             printf("Pattern verification failed at offset %"
-                   PRId64 ", %zd bytes\n", ctx->offset, ctx->qiov.size);
+                   PRId64 ", %zu bytes\n", ctx->offset, ctx->qiov.size);
         }
         g_free(cmp_buf);
     }