Index: uspace/srv/fs/minixfs/mfs_inode.c
===================================================================
--- uspace/srv/fs/minixfs/mfs_inode.c	(revision e5cebc92f3b58a12ebfca2c702faf9e64100bcdd)
+++ uspace/srv/fs/minixfs/mfs_inode.c	(revision bfbe16f6cfd52a23c4c32be25e3f35fa980055fa)
@@ -310,8 +310,4 @@
 {
 	unsigned i;
-
-	if (size_grow == 0)
-		return EOK;
-
 	struct mfs_sb_info *sbi = mnode->instance->sbi;
 	struct mfs_ino_info *ino_i = mnode->ino_i;
@@ -320,4 +316,6 @@
 	const uint32_t old_size = ino_i->i_size;
 	const uint32_t new_size = old_size + size_grow;
+
+	assert(size_grow > 0);
 
 	/*Compute the number of zones to add to the inode*/