linux-user/syscall.c: clean up local variable shadowing in do_ioctl_dm()

linux-user/syscall.c: clean up local variable shadowing in do_ioctl_dm()

Fix following warnings:

.../linux-user/syscall.c: In function 'do_ioctl_dm':
.../linux-user/syscall.c:5053:23: warning: declaration of 'arg_type' shadows a previous local [-Wshadow=local]
 5053 |         const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
      |                       ^~~~~~~~
.../linux-user/syscall.c:4991:20: note: shadowed declaration is here
 4991 |     const argtype *arg_type = ie->arg_type;
      |                    ^~~~~~~~
...//linux-user/syscall.c:5102:27: warning: declaration of 'arg_type' shadows a previous local [-Wshadow=local]
 5102 |             const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_name_list) };
      |                           ^~~~~~~~
.../linux-user/syscall.c:4991:20: note: shadowed declaration is here
 4991 |     const argtype *arg_type = ie->arg_type;
      |                    ^~~~~~~~
.../linux-user/syscall.c:5130:27: warning: declaration of 'arg_type' shadows a previous local [-Wshadow=local]
 5130 |             const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_spec) };
      |                           ^~~~~~~~
.../linux-user/syscall.c:4991:20: note: shadowed declaration is here
 4991 |     const argtype *arg_type = ie->arg_type;
      |                    ^~~~~~~~
.../linux-user/syscall.c:5170:27: warning: declaration of 'arg_type' shadows a previous local [-Wshadow=local]
 5170 |             const argtype arg_type[] = { MK_STRUCT(STRUCT_dm_target_versions) };
      |                           ^~~~~~~~
.../linux-user/syscall.c:4991:20: note: shadowed declaration is here
 4991 |     const argtype *arg_type = ie->arg_type;
      |                    ^~~~~~~~

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Message-ID: <20230925151029.461358-4-laurent@vivier.eu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Markus Armbruster <armbru@redhat.com>