style(rootfs): shfmt cleanup in rootfs-create.sh

Two minor formatting fixes shfmt suggested on the file as it stands
in the original PR commit (df7aaf9) — extra spaces in case fall-through
arm and a stray blank line. No semantic change. Kept as a separate
commit so the race-fix series stays scoped to qemu-static.sh.

Assisted-by: Claude:claude-opus-4.7
Signed-off-by: Igor Velkov <325961+iav@users.noreply.github.com>

Author: iav

lib/functions/rootfs/rootfs-create.sh

@@ -61,7 +61,7 @@ function create_new_rootfs_cache_via_debootstrap() {
 			local debootstrap_apt_mirror="http://localhost:3142/${APT_MIRROR}"
 			acng_check_status_or_restart
 			;;
-		no)     ;& # do nothing, fallthrough
+		no) ;& # do nothing, fallthrough
 		"")
 			:  # still do nothing
 			;; # stop falling
@@ -139,7 +139,6 @@ function create_new_rootfs_cache_via_debootstrap() {
 
 	skip_target_check="yes" local_apt_deb_cache_prepare "for mmdebstrap" # just for size reference in logs
 
-
 	[[ ! -f "${SDCARD}/bin/bash" ]] && exit_with_error "mmdebstrap did not produce /bin/bash"
 
 	# mmdebstrap done, libc/ld-linux are in ${SDCARD}. Disable qemu-arm in binfmt_misc