Replace C++ style comments by C ones

src/lib/openjp2/image.c

@@ -70,7 +70,7 @@ opj_image_t* OPJ_CALLCONV opj_image_create(OPJ_UINT32 numcmpts,
             comp->sgnd = cmptparms[compno].sgnd;
             if (comp->h != 0 &&
                     (OPJ_SIZE_T)comp->w > SIZE_MAX / comp->h / sizeof(OPJ_INT32)) {
-                // TODO event manager
+                /* TODO event manager */
                 opj_image_destroy(image);
                 return NULL;
             }

src/lib/openjp2/sparse_array.c

@@ -168,8 +168,8 @@ static OPJ_BOOL opj_sparse_array_int32_read_or_write(
                                                            +
                                                            (x - x0) * buf_col_stride;
                         if (x_incr == 4) {
-                            // Same code as general branch, but the compiler
-                            // can have an efficient memcpy()
+                            /* Same code as general branch, but the compiler */
+                            /* can have an efficient memcpy() */
                             for (j = 0; j < y_incr; j++) {
                                 memcpy(dest_ptr, src_ptr, sizeof(OPJ_INT32) * x_incr);
                                 dest_ptr += buf_line_stride;