kernel: don't fail if Modules.symvers doesn't exist

Kernels that do not use modules do not have the Modules.symvers file,
which causes the previous one-liner to fail.  Invert the logic so that
the absence of the Modules.symvers is a passing situation but we still
get failure checking on the install operation.

Upstream-Status: https://lore.kernel.org/openembedded-core/20230804170610.38795-1-patrick@stwcx.xyz/T/#u

Signed-off-by: Joel Stanley <joel@jms.id.au>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Iadd4f2f313f5059bccc22cb82ff7d58c9da13f49
diff --git a/poky/meta/classes-recipe/kernel.bbclass b/poky/meta/classes-recipe/kernel.bbclass
index 2e95631..6241fca 100644
--- a/poky/meta/classes-recipe/kernel.bbclass
+++ b/poky/meta/classes-recipe/kernel.bbclass
@@ -486,7 +486,7 @@
 	install -m 0644 System.map ${D}/${KERNEL_IMAGEDEST}/System.map-${KERNEL_VERSION}
 	install -m 0644 .config ${D}/${KERNEL_IMAGEDEST}/config-${KERNEL_VERSION}
 	install -m 0644 vmlinux ${D}/${KERNEL_IMAGEDEST}/vmlinux-${KERNEL_VERSION}
-	[ -e Module.symvers ] && install -m 0644 Module.symvers ${D}/${KERNEL_IMAGEDEST}/Module.symvers-${KERNEL_VERSION}
+	! [ -e Module.symvers ] || install -m 0644 Module.symvers ${D}/${KERNEL_IMAGEDEST}/Module.symvers-${KERNEL_VERSION}
 }
 
 # Must be ran no earlier than after do_kernel_checkout or else Makefile won't be in ${S}/Makefile
@@ -554,7 +554,7 @@
 
 	# Copy files required for module builds
 	cp System.map $kerneldir/System.map-${KERNEL_VERSION}
-	[ -e Module.symvers ] && cp Module.symvers $kerneldir/
+	! [ -e Module.symvers ] || cp Module.symvers $kerneldir/
 	cp .config $kerneldir/
 	mkdir -p $kerneldir/include/config
 	cp include/config/kernel.release $kerneldir/include/config/kernel.release