Removed unused variable enableCFStream

src/objective-c/GRPCClient/GRPCCall.m

@@ -790,9 +790,6 @@ const char *kCFStreamVarName = "grpc_cfstream";
 
     [self sendHeaders];
     [self invokeCall];
-
-    // Connectivity monitor is not required for CFStream
-    char *enableCFStream = getenv(kCFStreamVarName);
   }
 
   // Now that the RPC has been initiated, request writes can start.

src/objective-c/GRPCClient/private/GRPCChannelPool.m

@@ -214,9 +214,6 @@ static const NSTimeInterval kDefaultChannelDestroyDelay = 30;
 - (instancetype)initPrivate {
   if ((self = [super init])) {
     _channelPool = [NSMutableDictionary dictionary];
-
-    // Connectivity monitor is not required for CFStream
-    char *enableCFStream = getenv(kCFStreamVarName);
   }
   return self;
 }