fix incorrect results for catanf and catanl with some inputs

catan was fixed in 10e4bd37 but the
same bug in catanf and catanl was overlooked. the patch is completely
analogous.

src/complex/catanf.c

@@ -87,29 +87,17 @@ float complex catanf(float complex z)
 	x = crealf(z);
 	y = cimagf(z);
 
-	if ((x == 0.0f) && (y > 1.0f))
-		goto ovrf;
-
 	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);
 
 	t = y - 1.0f;
 	a = x2 + (t * t);
-	if (a == 0.0f)
-		goto ovrf;
 
 	t = y + 1.0f;
 	a = (x2 + (t * t))/a;
-	w = w + (0.25f * logf (a)) * I;
-	return w;
-
-ovrf:
-	// FIXME
-	w = MAXNUMF + MAXNUMF * I;
+	w = CMPLXF(w, 0.25f * logf(a));
 	return w;
 }

src/complex/catanl.c

@@ -97,30 +97,18 @@ long double complex catanl(long double complex z)
 	x = creall(z);
 	y = cimagl(z);
 
-	if ((x == 0.0L) && (y > 1.0L))
-		goto ovrf;
-
 	x2 = x * x;
 	a = 1.0L - x2 - (y * y);
-	if (a == 0.0L)
-		goto ovrf;
 
 	t = atan2l(2.0L * x, a) * 0.5L;
 	w = redupil(t);
 
 	t = y - 1.0L;
 	a = x2 + (t * t);
-	if (a == 0.0L)
-		goto ovrf;
 
 	t = y + 1.0L;
 	a = (x2 + (t * t)) / a;
-	w = w + (0.25L * logl(a)) * I;
-	return w;
-
-ovrf:
-	// FIXME
-	w = LDBL_MAX + LDBL_MAX * I;
+	w = CMPLXF(w, 0.25L * logl(a));
 	return w;
 }
 #endif