Clean up prior firmware dump

PKGBUILD

@@ -8,7 +8,7 @@ provides=("linux-spudd")
 # "linux-firmware=20170309.695f2d6-1"
 #conflicts=("linux-firmware")
 pkgrel=1
-pkgver=4.11.rc7.r54.gd0f2f5a8e2f1
+pkgver=4.12.rc4.r2.ga814e3d15098
 pkgdesc="Kernel build from head"
 arch=("x86_64")
 license=("GPL2.1")
@@ -40,5 +40,6 @@ package() {
   cp arch/x86/boot/bzImage ${boot_dir}/vmlinuz-spudd
   cp ${startdir}/spudd.preset ${preset_dir}
 
+  rm -Rf ${startdir}/firmware
   mv ${firmware_dir} ${startdir}
 }