Moved sanity check in lfs_format after compaction

After a bit of tweaking in 9dde5c7 to write out all superblocks
during lfs_format, additional writes were added after the sanity
checking normally done at the end.

This turned out to be a problem when porting littlefs, as it makes it
easy for addressing issues to not get caught during lfs_format.

Found by marekr, tristanclare94, and mjs513

lfs.c

@@ -425,8 +425,7 @@ static inline void lfs_superblock_tole32(lfs_superblock_t *superblock) {
     superblock->attr_max    = lfs_tole32(superblock->attr_max);
 }
 
-#ifndef LFS_NO_ASSERT
-static bool lfs_mlist_isopen(struct lfs_mlist *head,
+static inline bool lfs_mlist_isopen(struct lfs_mlist *head,
         struct lfs_mlist *node) {
     for (struct lfs_mlist **p = &head; *p; p = &(*p)->next) {
         if (*p == (struct lfs_mlist*)node) {
@@ -436,9 +435,8 @@ static bool lfs_mlist_isopen(struct lfs_mlist *head,
 
     return false;
 }
-#endif
 
-static void lfs_mlist_remove(lfs_t *lfs, struct lfs_mlist *mlist) {
+static inline void lfs_mlist_remove(lfs_t *lfs, struct lfs_mlist *mlist) {
     for (struct lfs_mlist **p = &lfs->mlist; *p; p = &(*p)->next) {
         if (*p == mlist) {
             *p = (*p)->next;
@@ -447,7 +445,7 @@ static void lfs_mlist_remove(lfs_t *lfs, struct lfs_mlist *mlist) {
     }
 }
 
-static void lfs_mlist_append(lfs_t *lfs, struct lfs_mlist *mlist) {
+static inline void lfs_mlist_append(lfs_t *lfs, struct lfs_mlist *mlist) {
     mlist->next = lfs->mlist;
     lfs->mlist = mlist;
 }
@@ -3618,12 +3616,6 @@ static int lfs_rawformat(lfs_t *lfs, const struct lfs_config *cfg) {
             goto cleanup;
         }
 
-        // sanity check that fetch works
-        err = lfs_dir_fetch(lfs, &root, (const lfs_block_t[2]){0, 1});
-        if (err) {
-            goto cleanup;
-        }
-
         // force compaction to prevent accidentally mounting any
         // older version of littlefs that may live on disk
         root.erased = false;
@@ -3631,6 +3623,12 @@ static int lfs_rawformat(lfs_t *lfs, const struct lfs_config *cfg) {
         if (err) {
             goto cleanup;
         }
+
+        // sanity check that fetch works
+        err = lfs_dir_fetch(lfs, &root, (const lfs_block_t[2]){0, 1});
+        if (err) {
+            goto cleanup;
+        }
     }
 
 cleanup: