Use consistent syntax for Bash function declarations

scripts/ci/build_ossfuzz.sh

@@ -5,7 +5,7 @@ ROOTDIR="/root/project"
 BUILDDIR="${ROOTDIR}/build"
 mkdir -p "${BUILDDIR}" && mkdir -p "$BUILDDIR/deps"
 
-generate_protobuf_bindings()
+function generate_protobuf_bindings
 {
   cd "${ROOTDIR}"/test/tools/ossfuzz
   # Generate protobuf C++ bindings
@@ -15,7 +15,7 @@ generate_protobuf_bindings()
   done
 }
 
-build_fuzzers()
+function build_fuzzers
 {
   cd "${BUILDDIR}"
   cmake .. -DCMAKE_BUILD_TYPE="${CMAKE_BUILD_TYPE:-Release}" \

scripts/ci/docker_upgrade.sh

@@ -1,11 +1,11 @@
 #!/usr/bin/env bash
 set -e
 
-function error() {
+function error {
   echo >&2 "ERROR: ${1} Aborting." && false
 }
 
-function warning() {
+function warning {
   echo >&2 "WARNING: ${1}"
 }