Meta: Explicitly set number of available inodes for genext2fs

According to its manpage genext2fs tries to create the file system with
as few inodes as possible. This causes SerenityOS to fail at boot time
when creating temporary files.

Meta/build-image-qemu.sh

@@ -191,7 +191,7 @@ if [ $use_genext2fs = 1 ]; then
     # genext2fs is very slow in generating big images, so I use a smaller image here. size can be updated
     # if it's not enough.
     # not using "-I $INODE_SIZE" since it hangs. Serenity handles whatever default this uses instead.
-    genext2fs -B 4096 -b $((DISK_SIZE_BYTES / 4096)) -d mnt _disk_image || die "try increasing image size (genext2fs -b)"
+    genext2fs -B 4096 -b $((DISK_SIZE_BYTES / 4096)) -N $INODE_COUNT -d mnt _disk_image || die "try increasing image size (genext2fs -b)"
     # if using docker with shared mount, file is created as root, so make it writable for users
     chmod 0666 _disk_image
 fi