linux-user: do_setsockopt: make ip_mreq_source local to the place where it is used

Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
Message-Id: <20240331100737.2724186-4-mjt@tls.msk.ru>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

linux-user/syscall.c

@@ -2049,7 +2049,6 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
 {
     abi_long ret;
     int val;
-    struct ip_mreq_source *ip_mreq_source;
 
     switch(level) {
     case SOL_TCP:
@@ -2123,6 +2122,9 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
         case IP_UNBLOCK_SOURCE:
         case IP_ADD_SOURCE_MEMBERSHIP:
         case IP_DROP_SOURCE_MEMBERSHIP:
+        {
+            struct ip_mreq_source *ip_mreq_source;
+
             if (optlen != sizeof (struct target_ip_mreq_source))
                 return -TARGET_EINVAL;
 
@@ -2133,7 +2135,7 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
             ret = get_errno(setsockopt(sockfd, level, optname, ip_mreq_source, optlen));
             unlock_user (ip_mreq_source, optval_addr, 0);
             break;
-
+        }
         default:
             goto unimplemented;
         }