Fix memory leaks in NewHope

crypto_kem/newhope1024cca/clean/poly.c

@@ -225,6 +225,7 @@ void PQCLEAN_NEWHOPE1024CCA_CLEAN_poly_uniform(poly *a, const unsigned char *see
                 }
             }
         }
+        shake128_ctx_release(&state);
     }
 }
 

crypto_kem/newhope1024cpa/clean/poly.c

@@ -225,6 +225,7 @@ void PQCLEAN_NEWHOPE1024CPA_CLEAN_poly_uniform(poly *a, const unsigned char *see
                 }
             }
         }
+        shake128_ctx_release(&state);
     }
 }
 

crypto_kem/newhope512cca/clean/poly.c

@@ -221,6 +221,7 @@ void PQCLEAN_NEWHOPE512CCA_CLEAN_poly_uniform(poly *a, const unsigned char *seed
                 }
             }
         }
+        shake128_ctx_release(&state);
     }
 }
 

crypto_kem/newhope512cpa/clean/poly.c

@@ -221,6 +221,7 @@ void PQCLEAN_NEWHOPE512CPA_CLEAN_poly_uniform(poly *a, const unsigned char *seed
                 }
             }
         }
+        shake128_ctx_release(&state);
     }
 }