Allow setting up to 8 bytes with the generic loader

The documentation for the generic loader says that "the maximum size of
the data is 8 bytes". However, attempts to set data-len=8 trigger the
following assertion failure:

../hw/core/generic-loader.c:59: generic_loader_reset: Assertion `s->data_len < sizeof(s->data)' failed.

The type of s->data is uint64_t (i.e. 8 bytes long), so I believe this
assert should use <= instead of <.

Fixes: e481a1f ("generic-loader: Add a generic loader")
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220120092715.7805-1-ptesarik@suse.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>

hw/core/generic-loader.c

@@ -56,7 +56,7 @@ static void generic_loader_reset(void *opaque)
     }
 
     if (s->data_len) {
-        assert(s->data_len < sizeof(s->data));
+        assert(s->data_len <= sizeof(s->data));
         dma_memory_write(s->cpu->as, s->addr, &s->data, s->data_len,
                          MEMTXATTRS_UNSPECIFIED);
     }