Fix Changelag PR number and uniformize code when prng fails

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
index 2ffd51c..e82cadc 100644
--- a/ChangeLog.d/fix-ecp-mul-memory-leak.txt
+++ b/ChangeLog.d/fix-ecp-mul-memory-leak.txt
@@ -1,3 +1,3 @@
 Bugfix
    * Fix potential memory leaks in ecp_randomize_jac() and ecp_randomize_mxz()
-     when PRNG function fails. Contributed by Jonas Lejeune in #3317.
+     when PRNG function fails. Contributed by Jonas Lejeune in #3318.
diff --git a/library/ecp.c b/library/ecp.c
index 3c4a91a..9522edf 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -2862,7 +2862,10 @@
              * such as secp224k1 are actually very close to the worst case.
              */
             if( ++count > 30 )
-                return( MBEDTLS_ERR_ECP_RANDOM_FAILED );
+            {
+                ret = MBEDTLS_ERR_ECP_RANDOM_FAILED;
+                goto cleanup;
+            }
 
             ret = mbedtls_mpi_lt_mpi_ct( d, &grp->N, &cmp );
             if( ret != 0 )