shell/caucase.sh: Remove unnecessary return statements.

If there is no return statement, shell functions return the status of the
last command they ran. So "return $?" as last function statement is
superfluous.

shell/caucase.sh

@@ -207,7 +207,6 @@ PUTNoOut () {
 
 _matchCertificateBoundary () {
   test "$1" = '-----END CERTIFICATE-----'
-  return $?
 }
 
 _matchPrivateKeyBoundary () {
@@ -270,7 +269,6 @@ expiresBefore () {
   enddate="$(openssl x509 -enddate -noout | sed 's/^[^=]*=//')"
   test $? -ne 0 && return 1
   test "$(date --date="$enddate" +%s)" -lt "$1"
-  return $?
 }
 
 printIfExpiresAfter () {
@@ -314,7 +312,6 @@ checkCertificateMatchesKey () {
   )" = "$(
     echo "$2" | openssl rsa -modulus -noout | sed 's/^Modulus=//'
   )"
-  return $?
 }
 
 checkDeps () {
@@ -412,7 +409,6 @@ revokeCertificate () {
     --header 'Content-Type: application/json' \
     --insecure \
     "$1/crt/revoke/"
-  return $?
 }
 
 revokeCRTWithoutKey () {
@@ -424,7 +420,6 @@ revokeCRTWithoutKey () {
     --header 'Content-Type: application/json' \
     --cacert "$2" \
     "$1/crt/revoke/"
-  return $?
 }
 
 revokeSerial () {
@@ -436,7 +431,6 @@ revokeSerial () {
     --header 'Content-Type: application/json' \
     --cacert "$2" \
     "$1/crt/revoke/"
-  return $?
 }
 
 updateCACertificate () {
@@ -476,19 +470,16 @@ updateCACertificate () {
 getCertificateRevocationList () {
   # Usage: <url> <ca>
   CURL --insecure "$1/crl" | openssl crl -CAfile "$2" 2> /dev/null
-  return $?
 }
 
 getCertificateSigningRequest () {
   # Usage: <url> <csr id>
   CURL --insecure "$1/csr/$2"
-  return $?
 }
 
 getPendingCertificateRequestList () {
   # Usage: <url> <ca> <user crt>
   CURL --cert "$3" --cacert "$2" "$1/csr"
-  return $?
 }
 
 createCertificateSigningRequest () {
@@ -503,13 +494,11 @@ createCertificateSigningRequest () {
       ;;
     esac
   done
-  return $?
 }
 
 deletePendingCertificateRequest () {
   # Usage: <url> <ca> <user crt> <csr id>
   CURL --request DELETE --cert "$3" --cacert "$2" "$1/csr/$4"
-  return $?
 }
 
 getCertificate () {
@@ -540,7 +529,6 @@ createCertificateWith () {
   # Usage: <url> <ca> <user crt> <csr id> < csr
   PUTNoOut --cert "$3" --cacert "$2" \
     --header 'Content-Type: application/pkcs10' "$1/crt/$4"
-  return $?
 }
 
 if [ $# -ne 0 ]; then