hw/arm/stellaris: Fix gptm_write() error message

Missed in df3692e0.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Message-id: 20180624040609.17572-16-f4bug@amsat.org
Reviewed-by: NPeter Maydell <peter.maydell@linaro.org>
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/arm/stellaris.c

@@ -294,7 +294,7 @@ static void gptm_write(void *opaque, hwaddr offset,
         break;
     default:
         qemu_log_mask(LOG_GUEST_ERROR,
-                      "GPTM: read at bad offset 0x%x\n", (int)offset);
+                      "GPTM: write at bad offset 0x%x\n", (int)offset);
     }
     gptm_update_irq(s);
 }