[RFC,05/10] fdc: refactor pick_geometry

diff --git a/hw/block/fdc.c b/hw/block/fdc.c
index be6bf25..4004b98 100644
--- a/hw/block/fdc.c
+++ b/hw/block/fdc.c
@@ -243,22 +243,20 @@  static void fd_recalibrate(FDrive *drv)
 
 static FDriveType get_default_drive_type(FDrive *drv);
 
-static void pick_geometry(BlockBackend *blk, int *nb_heads,
-                          int *max_track, int *last_sect,
-                          FDriveType drive_in, FDriveType *drive,
-                          FDriveRate *rate)
+static void pick_geometry(FDrive *drv, int *nb_heads)
 {
+    BlockBackend *blk = drv->blk;
     const FDFormat *parse;
     uint64_t nb_sectors, size;
     int i, first_match, match;
 
     /* Pick a default drive type if there's no media inserted AND we have
      * not yet announced our drive type to the CMOS. */
-    if (!blk_is_inserted(blk) && drive_in == FDRIVE_DRV_NONE) {
+    if (!blk_is_inserted(blk) && drv->drive == FDRIVE_DRV_NONE) {
         for (i = 0; ; i++) {
             parse = &fd_formats[i];
             if ((parse->drive == FDRIVE_DRV_NONE) ||
-                (parse->drive == *drive)) {
+                (parse->drive == get_default_drive_type(drv))) {
                 break;
             }
         }
@@ -273,8 +271,8 @@  static void pick_geometry(BlockBackend *blk, int *nb_heads,
         if (parse->drive == FDRIVE_DRV_NONE) {
             break;
         }
-        if (drive_in == parse->drive ||
-            drive_in == FDRIVE_DRV_NONE) {
+        if (drv->drive == parse->drive ||
+            drv->drive == FDRIVE_DRV_NONE) {
             size = (parse->max_head + 1) * parse->max_track *
                 parse->last_sect;
             if (nb_sectors == size) {
@@ -297,40 +295,33 @@  static void pick_geometry(BlockBackend *blk, int *nb_heads,
 
  out:
     *nb_heads = parse->max_head + 1;
-    *max_track = parse->max_track;
-    *last_sect = parse->last_sect;
-    *drive = parse->drive;
-    *rate = parse->rate;
+    drv->max_track = parse->max_track;
+    drv->last_sect = parse->last_sect;
+    drv->drive = parse->drive;
+    drv->media_rate = parse->rate;
 }
 
 /* Revalidate a disk drive after a disk change */
 static void fd_revalidate(FDrive *drv)
 {
-    int nb_heads, max_track, last_sect, ro;
-    FDriveType drive = get_default_drive_type(drv);
-    FDriveRate rate;
+    int nb_heads = -1;
 
     FLOPPY_DPRINTF("revalidate\n");
     if (drv->blk != NULL) {
-        ro = blk_is_read_only(drv->blk);
-        pick_geometry(drv->blk, &nb_heads, &max_track,
-                      &last_sect, drv->drive, &drive, &rate);
+        drv->ro = blk_is_read_only(drv->blk);
+        pick_geometry(drv, &nb_heads);
         if (!blk_is_inserted(drv->blk)) {
             FLOPPY_DPRINTF("No disk in drive\n");
         } else {
             FLOPPY_DPRINTF("Floppy disk (%d h %d t %d s) %s\n", nb_heads,
-                           max_track, last_sect, ro ? "ro" : "rw");
+                           drv->max_track, drv->last_sect,
+                           drv->ro ? "ro" : "rw");
         }
         if (nb_heads == 1) {
             drv->flags &= ~FDISK_DBL_SIDES;
         } else {
             drv->flags |= FDISK_DBL_SIDES;
         }
-        drv->max_track = max_track;
-        drv->last_sect = last_sect;
-        drv->ro = ro;
-        drv->drive = drive;
-        drv->media_rate = rate;
     } else {
         FLOPPY_DPRINTF("No drive connected\n");
         drv->last_sect = 0;