fix error found by coverity: check if ctx is != NULL before calling BN_CTX_end()
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@ -879,7 +879,8 @@ int ec_wNAF_precompute_mult(EC_GROUP *group, BN_CTX *ctx)
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ret = 1;
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err:
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BN_CTX_end(ctx);
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if (ctx != NULL)
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BN_CTX_end(ctx);
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if (new_ctx != NULL)
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BN_CTX_free(new_ctx);
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if (pre_comp)
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