awk: another smallish code shrink
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@ -2028,9 +2028,7 @@ static var *exec_builtin(node *op, var *res)
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if (i < 0) i = 0;
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n = (nargs > 2) ? getvar_i(av[2]) : l-i;
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if (n < 0) n = 0;
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s = xzalloc(n + 1);
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strncpy(s, as[0]+i, n);
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/*s[n] = '\0'; - xzalloc did it */
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s = xstrndup(as[0]+i, n);
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setvar_p(res, s);
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break;
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