hw/arm/vexpress: Don't double-free flash filename

Commits 6e05a12f and db25a158 both attempt to fix the
same "failed to free memory containing flash filename" bug,
with the effect that when they were both applied we ended
up freeing the memory twice. Delete the spurious extra free.
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Reviewed-by: NStefan Weil <sw@weilnetz.de>
Message-id: 1427968334-14527-1-git-send-email-peter.maydell@linaro.org

hw/arm/vexpress.c

@@ -583,7 +583,6 @@ static void vexpress_common_init(MachineState *machine)
             error_report("Could not load ROM image '%s'", bios_name);
             exit(1);
         }
-        g_free(fn);
     }
 
     /* Motherboard peripherals: the wiring is the same but the