Don't use IGNORE_ZERO_INF_SIGN in hypot tests

[Joseph S. Myers]

libm-test.inc has the IGNORE_ZERO_INF_SIGN facility, to say that an
expected result given as zero or infinity has indeterminate sign.

This is mostly used for complex.h functions where C99/C11 Annex G
explicitly says the sign is indeterminate.  However, two tests for
hypot use it as well, and it makes no sense there: hypot (infinity, x)
should always be *positive* infinity, for any x not a signaling NaN;
it never makes sense for hypot to return a negative (non-NaN) result.
This patch removes the bogus uses of IGNORE_ZERO_INF_SIGN.  Tested
x86_64 and x86.

2013-05-03  Joseph Myers  <joseph@codesourcery.com>

	* math/libm-test.inc (hypot_test): Do not use
	IGNORE_ZERO_INF_SIGN.

diff --git a/math/libm-test.inc b/math/libm-test.inc
index 8feb0a6..343590a 100644
--- a/math/libm-test.inc
+++ b/math/libm-test.inc
@@ -9129,8 +9129,8 @@ hypot_test (void)
 
   START (hypot);
 
-  TEST_ff_f (hypot, plus_infty, 1, plus_infty, IGNORE_ZERO_INF_SIGN);
-  TEST_ff_f (hypot, minus_infty, 1, plus_infty, IGNORE_ZERO_INF_SIGN);
+  TEST_ff_f (hypot, plus_infty, 1, plus_infty);
+  TEST_ff_f (hypot, minus_infty, 1, plus_infty);
 
 #ifndef TEST_INLINE
   TEST_ff_f (hypot, plus_infty, qnan_value, plus_infty);

-- 
Joseph S. Myers
joseph@codesourcery.com