Fix leak of a RAND_POOL in error condition

Fixes Coverity 1636676

Reviewed-by: Neil Horman <nhorman@openssl.org>
Reviewed-by: Paul Dale <ppzgs1@gmail.com>
Reviewed-by: Tim Hudson <tjh@openssl.org>
(Merged from openssl#26154)

providers/implementations/rands/seed_src.c

@@ -112,8 +112,10 @@ static int seed_src_generate(void *vseed, unsigned char *out, size_t outlen,
     entropy_available = ossl_pool_acquire_entropy(pool);
 
     if (entropy_available > 0) {
-        if (!ossl_rand_pool_adin_mix_in(pool, adin, adin_len))
+        if (!ossl_rand_pool_adin_mix_in(pool, adin, adin_len)) {
+            ossl_rand_pool_free(pool);
             return 0;
+        }
         memcpy(out, ossl_rand_pool_buffer(pool), ossl_rand_pool_length(pool));
     }
 

providers/implementations/rands/seed_src_jitter.c

@@ -198,8 +198,10 @@ static int jitter_generate(void *vseed, unsigned char *out, size_t outlen,
     entropy_available = ossl_prov_acquire_entropy_from_jitter(s, pool);
 
     if (entropy_available > 0) {
-        if (!ossl_rand_pool_adin_mix_in(pool, adin, adin_len))
+        if (!ossl_rand_pool_adin_mix_in(pool, adin, adin_len)) {
+            ossl_rand_pool_free(pool);
             return 0;
+        }
         memcpy(out, ossl_rand_pool_buffer(pool), ossl_rand_pool_length(pool));
     }