Revert "NameResolutionPal.Unix: fixed loss of address family informat…

…ion in async lookup (dotnet#47171)"

This reverts commit 2f25931.

src/libraries/Native/Unix/System.Native/pal_networking.c

@@ -601,6 +601,12 @@ int32_t SystemNative_GetHostEntryForNameAsync(const uint8_t* address, int32_t ad
         return GetAddrInfoErrorFlags_EAI_BADARG;
     }
 
+    sa_family_t platformFamily;
+    if (!TryConvertAddressFamilyPalToPlatform(addressFamily, &platformFamily))
+    {
+        return GetAddrInfoErrorFlags_EAI_FAMILY;
+    }
+
     struct GetAddrInfoAsyncState* state = malloc(sizeof(*state) + addrlen + 1);
 
     if (state == NULL)
@@ -616,22 +622,24 @@ int32_t SystemNative_GetHostEntryForNameAsync(const uint8_t* address, int32_t ad
 
     memcpy(state->address, address, addrlen + 1);
 
-    state->gai_request = (struct gaicb) {
-        .ar_name = state->address,
-        .ar_service = NULL,
-        .ar_request = &state->hint,
-        .ar_result = NULL
-    };
-    state->gai_requests = &state->gai_request;
-    state->sigevent = (struct sigevent) {
-        .sigev_notify = SIGEV_THREAD,
-        .sigev_value = {
-            .sival_ptr = state
+    *state = (struct GetAddrInfoAsyncState) {
+        .gai_request = {
+            .ar_name = state->address,
+            .ar_service = NULL,
+            .ar_request = &state->hint,
+            .ar_result = NULL
+        },
+        .gai_requests = &state->gai_request,
+        .sigevent = {
+            .sigev_notify = SIGEV_THREAD,
+            .sigev_value = {
+                .sival_ptr = state
+            },
+            .sigev_notify_function = GetHostEntryForNameAsyncComplete
         },
-        .sigev_notify_function = GetHostEntryForNameAsyncComplete
+        .entry = entry,
+        .callback = callback
     };
-    state->entry = entry;
-    state->callback = callback;
 
     atomic_thread_fence(memory_order_release);