boot: remove unused boot_devices_bitmap variable

In addition to removing the variable, this also renames the parse_bootdevices()
function to validate_bootdevices(), as we don't need its return value anymore.
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>
Acked-by: NJuan Quintela <quintela@redhat.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

vl.c

@@ -1183,7 +1183,7 @@ int qemu_boot_set(const char *boot_devices)
     return boot_set_handler(boot_set_opaque, boot_devices);
 }
 
-static int parse_bootdevices(char *devices)
+static void validate_bootdevices(char *devices)
 {
     /* We just do some generic consistency checks */
     const char *p;
@@ -1209,7 +1209,6 @@ static int parse_bootdevices(char *devices)
         }
         bitmap |= 1 << (*p - 'a');
     }
-    return bitmap;
 }
 
 static void restore_boot_devices(void *opaque)
@@ -2556,7 +2555,6 @@ static const QEMUOption *lookup_opt(int argc, char **argv,
 int main(int argc, char **argv, char **envp)
 {
     const char *gdbstub_dev = NULL;
-    uint32_t boot_devices_bitmap = 0;
     int i;
     int snapshot, linux_boot;
     const char *icount_option = NULL;
@@ -2875,13 +2873,13 @@ int main(int argc, char **argv, char **envp)
 
                     if (legacy ||
                         get_param_value(buf, sizeof(buf), "order", optarg)) {
-                        boot_devices_bitmap = parse_bootdevices(buf);
+                        validate_bootdevices(buf);
                         pstrcpy(boot_devices, sizeof(boot_devices), buf);
                     }
                     if (!legacy) {
                         if (get_param_value(buf, sizeof(buf),
                                             "once", optarg)) {
-                            boot_devices_bitmap |= parse_bootdevices(buf);
+                            validate_bootdevices(buf);
                             standard_boot_devices = qemu_strdup(boot_devices);
                             pstrcpy(boot_devices, sizeof(boot_devices), buf);
                             qemu_register_reset(restore_boot_devices,