Fix memory leak in opj_j2k_merge_ppt.

third_party/libopenjpeg20/0023-j2k_merge_ppt_leak.patch

Index: third_party/libopenjpeg20/0023-j2k_merge_ppt_leak.patch
diff --git a/third_party/libopenjpeg20/0023-j2k_merge_ppt_leak.patch b/third_party/libopenjpeg20/0023-j2k_merge_ppt_leak.patch
new file mode 100644
index 0000000000000000000000000000000000000000..d76bb79ffc1e93b3b50bdd5fbb948c36bfbb40d4
--- /dev/null
+++ b/third_party/libopenjpeg20/0023-j2k_merge_ppt_leak.patch
@@ -0,0 +1,16 @@
+diff --git a/third_party/libopenjpeg20/j2k.c b/third_party/libopenjpeg20/j2k.c
+index 6346c21..7712d38 100644
+--- a/third_party/libopenjpeg20/j2k.c
++++ b/third_party/libopenjpeg20/j2k.c
+@@ -3807,7 +3807,10 @@ static OPJ_BOOL opj_j2k_merge_ppt(opj_tcp_t *p_tcp, opj_event_mgr_t * p_manager)
+ 	/* preconditions */
+ 	assert(p_tcp != 00);
+ 	assert(p_manager != 00);
+-	assert(p_tcp->ppt_buffer == NULL);
++	
++	if(p_tcp->ppt_buffer != NULL) {
++		return OPJ_FALSE;
++	}
+ 	
+ 	if (p_tcp->ppt == 0U) {
+ 		return OPJ_TRUE;