improve memory rebinding for mach_port_get_attributes call

Author: glessard

Sources/System/MachPort.swift

@@ -263,11 +263,22 @@ extension Mach.Port where RightType == Mach.ReceiveRight {
   public var makeSendCount: mach_port_mscount_t {
     get {
       var status: mach_port_status = mach_port_status()
-      var size: mach_msg_type_number_t = mach_msg_type_number_t(MemoryLayout<mach_port_status>.size / MemoryLayout<natural_t>.size)
-      withUnsafeMutablePointer(to: &size) { size in
-        withUnsafeMutablePointer(to: &status) { status in
-          let info = UnsafeMutableRawPointer(status).bindMemory(to: integer_t.self, capacity: 1)
-          _machPrecondition(mach_port_get_attributes(mach_task_self_, _name, MACH_PORT_RECEIVE_STATUS, info, size))
+      var size = mach_msg_type_number_t(
+        MemoryLayout<mach_port_status>.size / MemoryLayout<natural_t>.size
+      )
+
+      withUnsafeMutablePointer(to: &status) {
+        let status = UnsafeMutableBufferPointer(start: $0, count: 1)
+        status.withMemoryRebound(to: integer_t.self) {
+          _machPrecondition(
+            mach_port_get_attributes(
+              mach_task_self_,
+              _name,
+              MACH_PORT_RECEIVE_STATUS,
+              $0.baseAddress,
+              &size
+            )
+          )
         }
       }
       return status.mps_mscount