target/alpha: Tidy up alpha_cpu_class_by_name()

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Gavin Shan <gshan@redhat.com>
Message-Id: <20230908112235.75914-2-philmd@linaro.org>

target/alpha/cpu.c

@@ -142,13 +142,10 @@ static ObjectClass *alpha_cpu_class_by_name(const char *cpu_model)
     typename = g_strdup_printf(ALPHA_CPU_TYPE_NAME("%s"), cpu_model);
     oc = object_class_by_name(typename);
     g_free(typename);
-    if (oc != NULL && object_class_is_abstract(oc)) {
-        oc = NULL;
-    }
 
     /* TODO: remove match everything nonsense */
-    /* Default to ev67; no reason not to emulate insns by default. */
-    if (!oc) {
+    if (!oc || object_class_is_abstract(oc)) {
+        /* Default to ev67; no reason not to emulate insns by default. */
         oc = object_class_by_name(ALPHA_CPU_TYPE_NAME("ev67"));
     }