mk/kernel-build.mk: Drop redundant assignments

If ADK_TARGET_KERNEL_VMLINUX_BOOTP==y, ADK_TARGET_KERNEL=bootpfile hence
no need for the clause. Also, KERNEL_TARGET defaults to
$(ADK_TARGET_KERNEL) already.

Signed-off-by: Phil Sutter <phil@nwl.cc>

mk/kernel-build.mk

@@ -17,15 +17,9 @@ KERNEL_FILE:=$(ADK_TARGET_KERNEL)
 KERNEL_TARGET:=$(ADK_TARGET_KERNEL)
 ifeq ($(ADK_TARGET_KERNEL_LINUXBIN),y)
 KERNEL_FILE:=vmlinux
-KERNEL_TARGET:=$(ADK_TARGET_KERNEL)
 endif
 ifeq ($(ADK_TARGET_KERNEL_ZIMAGE),y)
 KERNEL_FILE:=vmlinux
-KERNEL_TARGET:=$(ADK_TARGET_KERNEL)
-endif
-ifeq ($(ADK_TARGET_KERNEL_VMLINUX_BOOTP),y)
-KERNEL_FILE:=bootpfile
-KERNEL_TARGET:=bootpfile
 endif
 ifeq ($(ADK_TARGET_KERNEL_VMLINUX_EFI),y)
 KERNEL_FILE:=vmlinux.efi
@@ -41,7 +35,6 @@ KERNEL_TARGET:=all
 endif
 ifeq ($(ADK_TARGET_KERNEL_IMAGE),y)
 KERNEL_FILE:=vmlinux
-KERNEL_TARGET:=$(ADK_TARGET_KERNEL)
 endif
 ifeq ($(ADK_TARGET_KERNEL_SIMPLEIMAGE),y)
 KERNEL_FILE:=vmlinux.bin