Fix FIPS202 API memory leaks in Dilithium

crypto_sign/dilithium2/avx2/sign.c

@@ -95,6 +95,7 @@ void PQCLEAN_DILITHIUM2_AVX2_challenge(poly *c,
         c->coeffs[b] ^= -(signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************

crypto_sign/dilithium2/clean/sign.c

@@ -85,6 +85,7 @@ void PQCLEAN_DILITHIUM2_CLEAN_challenge(poly *c,
         c->coeffs[b] ^= -((int32_t)signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************

crypto_sign/dilithium3/avx2/sign.c

@@ -107,6 +107,7 @@ void PQCLEAN_DILITHIUM3_AVX2_challenge(poly *c,
         c->coeffs[b] ^= -(signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************

crypto_sign/dilithium3/clean/sign.c

@@ -85,6 +85,7 @@ void PQCLEAN_DILITHIUM3_CLEAN_challenge(poly *c,
         c->coeffs[b] ^= -((int32_t)signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************

crypto_sign/dilithium4/avx2/sign.c

@@ -122,6 +122,7 @@ void PQCLEAN_DILITHIUM4_AVX2_challenge(poly *c,
         c->coeffs[b] ^= -(signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************

crypto_sign/dilithium4/clean/sign.c

@@ -85,6 +85,7 @@ void PQCLEAN_DILITHIUM4_CLEAN_challenge(poly *c,
         c->coeffs[b] ^= -((int32_t)signs & 1) & (1 ^ (Q - 1));
         signs >>= 1;
     }
+    shake256_ctx_release(&state);
 }
 
 /*************************************************