[newlib-cygwin] Delete check in catan, catanf, and catanl functions.

[Jeff Johnston <jjohnstn@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=dcb2b7d7b8456827d4cd82b5798526e7cd483e36

commit dcb2b7d7b8456827d4cd82b5798526e7cd483e36
Author: Joseph Faulls <Joseph.Faulls@imgtec.com>
Date:   Tue Oct 10 15:12:00 2023 -0400

    Delete check in catan, catanf, and catanl functions.
    
    The check incorrectly results in catan returning nan + inf i when real part is +/- 1 and
    imaginary part is 0.  The same occurs for real 0.8 and imaginary 0.6.
    
    The change ends up matching glibc behaviour.

Diff:
---
 newlib/libm/complex/catan.c  | 2 --
 newlib/libm/complex/catanf.c | 2 --
 newlib/libm/complex/catanl.c | 2 --
 3 files changed, 6 deletions(-)

diff --git a/newlib/libm/complex/catan.c b/newlib/libm/complex/catan.c
index 77510ec2f..34d75b849 100644
--- a/newlib/libm/complex/catan.c
+++ b/newlib/libm/complex/catan.c
@@ -105,8 +105,6 @@ catan(double complex z)
 
 	x2 = x * x;
 	a = 1.0 - x2 - (y * y);
-	if (a == 0.0)
-		goto ovrf;
 
 	t = 0.5 * atan2(2.0 * x, a);
 	w = _redupi(t);
diff --git a/newlib/libm/complex/catanf.c b/newlib/libm/complex/catanf.c
index ac1a65c08..9dc2fb23f 100644
--- a/newlib/libm/complex/catanf.c
+++ b/newlib/libm/complex/catanf.c
@@ -54,8 +54,6 @@ catanf(float complex z)
 
 	x2 = x * x;
 	a = 1.0f - x2 - (y * y);
-	if (a == 0.0f)
-		goto ovrf;
 
 	t = 0.5f * atan2f(2.0f * x, a);
 	w = _redupif(t);
diff --git a/newlib/libm/complex/catanl.c b/newlib/libm/complex/catanl.c
index ee2a25930..13839ac73 100644
--- a/newlib/libm/complex/catanl.c
+++ b/newlib/libm/complex/catanl.c
@@ -51,8 +51,6 @@ catanl(long double complex z)
 
 	x2 = x * x;
 	a = 1.0L - x2 - (y * y);
-	if (a == 0.0)
-		goto ovrf;
 
 	t = 0.5L * atan2l(2.0L * x, a);
 	w = _redupil(t);