hw/core: fix missing return value in load_image_targphys_as()

Signed-off-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alistair Francis <alistair.francis@xilinx.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

hw/core/loader.c

@@ -150,7 +150,9 @@ int load_image_targphys_as(const char *filename,
         return -1;
     }
     if (size > 0) {
-        rom_add_file_fixed_as(filename, addr, -1, as);
+        if (rom_add_file_fixed_as(filename, addr, -1, as) < 0) {
+            return -1;
+        }
     }
     return size;
 }