[Buildroot] [PATCH] linux: ensure correct make targets are used for cuImage/simpleImage.<dtb>

[Peter Korsgaard]

Fixes https://gitlab.com/buildroot.org/buildroot/-/jobs/66561794

LINUX_DTS_NAME may end up with a leading space because of the += logic, and
may contain multiple dts files - Neither of which works when we construct
the {cu,simple}Image.$(LINUX_DTS_NAME) make target name.

Fix it by using the first word in the variable.

Signed-off-by: Peter Korsgaard <peter at korsgaard.com>
---
 linux/linux.mk | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/linux/linux.mk b/linux/linux.mk
index 9e646baffc..b6b91391b6 100644
--- a/linux/linux.mk
+++ b/linux/linux.mk
@@ -155,9 +155,9 @@ LINUX_IMAGE_NAME = zImage.epapr
 else ifeq ($(BR2_LINUX_KERNEL_APPENDED_ZIMAGE),y)
 LINUX_IMAGE_NAME = zImage
 else ifeq ($(BR2_LINUX_KERNEL_CUIMAGE),y)
-LINUX_IMAGE_NAME = cuImage.$(LINUX_DTS_NAME)
+LINUX_IMAGE_NAME = cuImage.$(firstword $(LINUX_DTS_NAME))
 else ifeq ($(BR2_LINUX_KERNEL_SIMPLEIMAGE),y)
-LINUX_IMAGE_NAME = simpleImage.$(LINUX_DTS_NAME)
+LINUX_IMAGE_NAME = simpleImage.$(firstword $(LINUX_DTS_NAME))
 else ifeq ($(BR2_LINUX_KERNEL_IMAGE),y)
 LINUX_IMAGE_NAME = Image
 else ifeq ($(BR2_LINUX_KERNEL_LINUX_BIN),y)
-- 
2.11.0