Fix unused variable warnings in float2 test

Enable the part of the test which is uses the two variables, fixing thus
the warnings. Also, there is currently no reason for running the test
with -Wno-error, so don't do it.

Author: jermar

uspace/app/tester/Makefile

@@ -31,7 +31,7 @@ USPACE_PREFIX = ../..
 
 # TODO: softfloat testing should be done via unit tests.
 LIBS = block softfloat drv math
-EXTRA_CFLAGS = -I$(LIBSOFTFLOAT_PREFIX) -Wno-error
+EXTRA_CFLAGS = -I$(LIBSOFTFLOAT_PREFIX)
 
 BINARY = tester
 

uspace/app/tester/float/float2.c

@@ -208,7 +208,7 @@ static bool cmp_double(double a, double b)
 const char *test_float2(void)
 {
 	bool fail = false;
-#if 0
+
 	for (unsigned int i = 0; i < OPERANDS; i++) {
 		double res = acos(arguments_acos[i]);
 
@@ -248,7 +248,7 @@ const char *test_float2(void)
 			fail = true;
 		}
 	}
-#endif
+
 	for (unsigned int i = 0; i < OPERANDS; i++) {
 		double res = atan(arguments_atan[i]);