mac-virtualcam: Remove unnecessary IOSurfaceLocks in Mach Server

IOSurface locks are only necessary when any processing with the data
contained in the surface is done and an explicit copy of data from GPU
memory back to CPU memory is needed.

plugins/mac-virtualcam/src/obs-plugin/OBSDALMachServer.mm

@@ -15,7 +15,6 @@
 @property NSPort *port;
 @property NSMutableSet *clientPorts;
 @property NSRunLoop *runLoop;
-@property uint32_t seed;
 @end
 
 @implementation OBSDALMachServer
@@ -156,7 +155,6 @@
 			return;
 		}
 
-		IOSurfaceLock(surface, 0, &_seed);
 		mach_port_t framePort = IOSurfaceCreateMachPort(surface);
 
 		if (!framePort) {
@@ -176,7 +174,6 @@
 					 ]];
 
 		mach_port_deallocate(mach_task_self(), framePort);
-		IOSurfaceUnlock(surface, 0, &_seed);
 	}
 }