tests/fp/fp-test: Replace the word 'blacklist'

Follow the inclusive terminology from the "Conscious Language in your
Open Source Projects" guidelines [*] and replace the word "blacklist"
appropriately.

[*] https://github.com/conscious-lang/conscious-lang-docs/blob/main/faq.md

Acked-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20210303184644.1639691-6-philmd@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

tests/fp/fp-test.c

@@ -123,7 +123,7 @@ static void not_implemented(void)
     fprintf(stderr, "Not implemented.\n");
 }
 
-static bool blacklisted(unsigned op, int rmode)
+static bool is_allowed(unsigned op, int rmode)
 {
     /* odd has not been implemented for any 80-bit ops */
     if (rmode == softfloat_round_odd) {
@@ -161,10 +161,10 @@ static bool blacklisted(unsigned op, int rmode)
         case F32_TO_EXTF80:
         case F64_TO_EXTF80:
         case F128_TO_EXTF80:
-            return true;
+            return false;
         }
     }
-    return false;
+    return true;
 }
 
 static void do_testfloat(int op, int rmode, bool exact)
@@ -194,7 +194,7 @@ static void do_testfloat(int op, int rmode, bool exact)
     verCases_writeFunctionName(stderr);
     fputs("\n", stderr);
 
-    if (blacklisted(op, rmode)) {
+    if (!is_allowed(op, rmode)) {
         not_implemented();
         return;
     }