build/release/roms: minor cleanup

split actual purging of blobs to a function

rename functions for clarity

resources/scripts/build/release/roms

@@ -90,7 +90,7 @@ make_archive()
 	# remove ME/MRC/EC firmware from ROM images
 	if [ "${CONFIG_HAVE_ME_BIN}" = "y" ] \
 			|| [ "${target}" = "e6400nvidia_4mb" ]; then
-		purge_blobs "${romdir}"
+		strip_archive "${romdir}"
 	fi
 
 	printf "Generating release/%s/roms/%s-%s_%s.tar.xz\n" \
@@ -110,7 +110,7 @@ make_archive()
 	fi
 }
 
-purge_blobs()
+strip_archive()
 {
 	romdir=${1}
 
@@ -137,6 +137,14 @@ purge_blobs()
 
 	for romfile in "${romdir}"/*.rom
 	do
+		strip_rom_image "${romfile}"
+	done
+}
+
+strip_rom_image()
+{
+	romfile=${1}
+
 	if [ ! -f "${romfile}" ]; then
 		continue
 	fi
@@ -164,7 +172,6 @@ purge_blobs()
 			-n "pci10de,06eb.rom" \
 			|| exit 1
 	fi
-	done
 }
 
 err()