[source] brcm47xx: image: make TRX steps work with rootfs passed as $@

[LEDE Commits]

rmilecki pushed a commit to source.git, branch master:
https://git.lede-project.org/027b2c5b83e1ce7f9226e21c93e08ffe9c38a552

commit 027b2c5b83e1ce7f9226e21c93e08ffe9c38a552
Author: Rafał Miłecki <rafal at milecki.pl>
AuthorDate: Fri Oct 28 16:43:19 2016 +0200

    brcm47xx: image: make TRX steps work with rootfs passed as $@
    
    Signed-off-by: Rafał Miłecki <rafal at milecki.pl>
---
 target/linux/brcm47xx/image/Makefile | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/target/linux/brcm47xx/image/Makefile b/target/linux/brcm47xx/image/Makefile
index 84e7005..2c79ab0 100644
--- a/target/linux/brcm47xx/image/Makefile
+++ b/target/linux/brcm47xx/image/Makefile
@@ -51,10 +51,11 @@ endef
 define Build/trx-with-loader
 	$(STAGING_DIR_HOST)/bin/trx \
 		-m 33554432 \
-		-o $@ \
+		-o $@.new \
 		-f $(KDIR)/loader.gz \
 		-f $(IMAGE_KERNEL) \
 		$(call trxalign/$(FILESYSTEM),$(FILESYSTEM))
+	mv $@.new $@
 endef
 
 define Build/trx-v2-with-loader
@@ -71,9 +72,10 @@ endef
 define Build/trx-without-loader
 	$(STAGING_DIR_HOST)/bin/trx \
 		-m 33554432 \
-		-o $@ \
+		-o $@.new \
 		-f $(IMAGE_KERNEL) \
 		$(call trxalign/$(FILESYSTEM),$(FILESYSTEM))
+	mv $@.new $@
 endef
 
 define Build/asus-trx