linux-user/syscall.c: do_ioctl_dm: Need to call unlock_user() before going to failure return in default case

In abi_long do_ioctl_dm(), after lock_user() call, the code does
not call unlock_user() before going to failure return in default case.

Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

linux-user/syscall.c

diff --git a/linux-user/syscall.c b/linux-user/syscall.c
index 310080c..5720195 100644
--- a/linux-user/syscall.c
+++ b/linux-user/syscall.c
@@ -3576,6 +3576,7 @@
     }
     default:
         ret = -TARGET_EINVAL;
+        unlock_user(argptr, guest_data, 0);
         goto out;
     }
     unlock_user(argptr, guest_data, 0);
@@ -3695,6 +3696,7 @@
             break;
         }
         default:
+            unlock_user(argptr, guest_data, 0);
             ret = -TARGET_EINVAL;
             goto out;
         }