EFI changes break NET4501 kernel build

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

Recent changes related to EFI support cause the NET4501 kernel config
to fail building with:

[...]
#   compile  NET4501/efi.o
/r1/build/current/tools/amd64/bin/i486--netbsdelf-gcc -msoft-float -mno-mmx -mno-sse -mno-avx -ffreestanding -fno-zero-initialized-in-bss -Os -fstack-protector -Wstack-protector --param ssp-buffer-size=1 -fno-strict-aliasing -fno-common -std=gnu99 -Werror -Wall -Wno-main -Wno-format-zero-length -Wpointer-arith -Wmissing-prototypes -Wstrict-prototypes -Wold-style-definition -Wswitch -Wshadow -Wcast-qual -Wwrite-strings -Wno-unreachable-code -Wno-pointer-sign -Wno-attributes -Wextra -Wno-unused-parameter -Wold-style-definition -Wno-sign-compare --sysroot=/r1/build/current/DEST/i386 -Di386 -I. -I/x/current/src/sys/external/bsd/acpica/dist -I/x/current/src/sys/../common/lib/libx86emu -I/x/current/src/sys/../common/include -I/x/current/src/sys/arch -I/x/current/src/sys -nostdinc -DTIMER_FREQ=1189200 -D_KERNEL -D_KERNEL_OPT -std=gnu99 -I/x/current/src/sys/lib/libkern/../../../common/lib/libc/quad -I/x/current/src/sys/lib/libkern/../../../common/lib/libc/string -I/x/current/src/sys/lib/libkern/../../../common/lib/libc/arch/i386/string -D_FORTIFY_SOURCE=2 -I/x/current/src/sys/external/bsd/ipf -I/x/current/src/sys/external/isc/atheros_hal/dist -I/x/current/src/sys/external/isc/atheros_hal/ic -c /x/current/src/sys/arch/x86/x86/efi.c -o efi.o
/x/current/src/sys/arch/x86/x86/efi.c: In function 'efi_get_e820memmap':
/x/current/src/sys/arch/x86/x86/efi.c:421:26: error: 'end_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   entry->size = end_addr - start_addr;
                          ^
/x/current/src/sys/arch/x86/x86/efi.c:420:15: error: 'start_addr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
   entry->addr = start_addr;
               ^
cc1: all warnings being treated as errors
*** [efi.o] Error code 1

nbmake: stopped in /r1/build/current/obj/i386/sys/arch/i386/compile/NET4501
1 error

nbmake: stopped in /r1/build/current/obj/i386/sys/arch/i386/compile/NET4501

ERROR: Failed to make all in "/r1/build/current/obj/i386/sys/arch/i386/compile/NET4501"


Considering the target, perhaps EFI support should be excluded from this
kernel config?

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