rtpengine: add patch fixing compilation warning for kernel module

Add patch fixing compilation warning for kernel module.
Always dynamically allocate buffer for proc_control_read_write.
Fix compilation warning:
/builder/shared-workdir/build/build_dir/target-arm_cortex-a8+vfpv3_musl_eabi/rtpengine-no-transcode/rtpengine-mr10.5.2.6/kernel-module/xt_RTPENGINE.c: In function 'proc_control_read_write':
/builder/shared-workdir/build/build_dir/target-arm_cortex-a8+vfpv3_musl_eabi/rtpengine-no-transcode/rtpengine-mr10.5.2.6/kernel-module/xt_RTPENGINE.c:3573:1: error: the frame size of 1272 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
 3573 | }
      | ^
Signed-off-by: NChristian Marangi <ansuelsmth@gmail.com>

net/rtpengine/patches/07-always-dynamically-allocate-buffer-for-kernel-mod.patch

+--- a/kernel-module/xt_RTPENGINE.c
++++ b/kernel-module/xt_RTPENGINE.c
+@@ -3455,14 +3455,11 @@ static inline ssize_t proc_control_read_
+ 	struct inode *inode;
+ 	uint32_t id;
+ 	struct rtpengine_table *t;
+-	struct rtpengine_message msgbuf;
+ 	struct rtpengine_message *msg;
+ 	int err;
+ 
+ 	if (buflen < sizeof(*msg))
+ 		return -EIO;
+-	if (buflen == sizeof(*msg))
+-		msg = &msgbuf;
+ 	else { /* > */
+ 		msg = kmalloc(buflen, GFP_KERNEL);
+ 		if (!msg)
+@@ -3559,16 +3556,14 @@ static inline ssize_t proc_control_read_
+ 			goto out;
+ 	}
+ 
+-	if (msg != &msgbuf)
+-		kfree(msg);
++	kfree(msg);
+ 
+ 	return buflen;
+ 
+ err:
+ 	table_put(t);
+ out:
+-	if (msg != &msgbuf)
+-		kfree(msg);
++	kfree(msg);
+ 	return err;
+ }
+ static ssize_t proc_control_write(struct file *file, const char __user *ubuf, size_t buflen, loff_t *off) {