Staging: hv: declare NetVscOnChannelCallback() static

NetVscOnChannelCallback() was prototyped as static, but the actual
declartion of the function was not static.
Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Hank Janssen <hjanssen@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/staging/hv/NetVsc.c

@@ -1286,7 +1286,7 @@ static void NetVscOnReceiveCompletion(void *Context)
 	DPRINT_EXIT(NETVSC);
 }
 
-void NetVscOnChannelCallback(void *Context)
+static void NetVscOnChannelCallback(void *Context)
 {
 	int ret;
 	struct hv_device *device = Context;