Fix test fails: ext/standard/tests/general_functions/bug27678.phpt

After commit 3e62aae, number_format() returns string with length,
but _php_math_number_format_ex_len() didn't set string length
on nan and inf. This cause segfault when destruct the return value.

Author: reeze

ext/standard/math.c

@@ -1120,6 +1120,10 @@ static char *_php_math_number_format_ex_len(double d, int dec, char *dec_point,
 	tmplen = spprintf(&tmpbuf, 0, "%.*F", dec, d);
 
 	if (tmpbuf == NULL || !isdigit((int)tmpbuf[0])) {
+		if (result_len) {
+			*result_len = tmplen;
+		}
+
 		return tmpbuf;
 	}
 

ext/standard/tests/general_functions/bug27678.phpt

@@ -6,9 +6,11 @@ Bug #27678 (number_format() crashes with large numbers)
 number_format(1e80, 0, '', ' ');
 number_format(1e300, 0, '', ' ');
 number_format(1e320, 0, '', ' ');
-number_format(1e1000, 0, '', ' ');
+$num = number_format(1e1000, 0, '', ' ');
+var_dump(strlen($num) == 3); // $num == 'inf'
 
 echo "Done\n";
 ?>
 --EXPECT--	
+bool(true)
 Done