simplify initialising variables in shell scripts

Signed-off-by: Leah Rowe <leah@libreboot.org>

script/update/blobs/inject

@@ -292,12 +292,10 @@ inject_blob_dell_e6400_vgarom_nvidia()
 inject_blob_smsc_sch5545_ec()
 {
 	rom="${1}"
-
 	_sch5545ec_location="${CONFIG_SMSC_SCH5545_EC_FW_FILE#../../}"
 
-	if [ ! -f "${_sch5545ec_location}" ]; then
+	[ -f "${_sch5545ec_location}" ] || \
 		err "inject_blob_smsc_sch5545_ec: SCH5545 fw missing"
-	fi
 
 	"${cbfstool}" "${rom}" add -f "${_sch5545ec_location}" \
 	    -n sch5545_ecfw.bin -t raw || \
@@ -307,12 +305,10 @@ inject_blob_smsc_sch5545_ec()
 modify_gbe()
 {
 	printf "changing mac address in gbe to ${new_mac}\n"
-
-	rom="${1}"
-
 	[ -z ${CONFIG_GBE_BIN_PATH} ] && \
 		err "modify_gbe: ${board}: CONFIG_GBE_BIN_PATH not set"
 
+	rom="${1}"
 	_gbe_location=${CONFIG_GBE_BIN_PATH#../../}
 
 	[ -f "${_gbe_location}" ] || \

script/update/project/repo

@@ -8,13 +8,8 @@
 . "include/git.sh"
 . "include/option.sh"
 
-name=""
-rev=""
-loc=""
-url=""
-bkup_url=""
+eval "$(setvars "" name rev loc url bkup_url depend)"
 tmp_dir="${PWD}/tmp/gitclone"
-depend=""
 
 main()
 {

script/update/project/trees

@@ -11,11 +11,7 @@ set -u -e
 . "include/git.sh"
 . "include/option.sh"
 
-_target=""
-tree=""
-rev=""
-project=""
-cfgsdir=""
+eval "$(setvars "" _target tree rev project cfgsdir)"
 
 main()
 {
@@ -40,7 +36,6 @@ main()
 		download_for_target "${x}" || \
 		    err "${project}/${target}: cannot download source tree"
 	done
-
 	rm -f "${cfgsdir}"/*/seen || err_rm_seen "main 3"
 }