Add Changelog entry for #3318

Signed-off-by: Jonas <jonas.lejeune4420@gmail.com>
diff --git a/ChangeLog.d/fix-ecp-mul-memory-leak.txt b/ChangeLog.d/fix-ecp-mul-memory-leak.txt
new file mode 100644
index 0000000..2ffd51c
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+++ b/ChangeLog.d/fix-ecp-mul-memory-leak.txt
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+Bugfix
+   * Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz()
+     when PRNG function fails. Contributed by Jonas Lejeune in #3317.