install_kmod_with_fw: make fast case faster

index 15a75b9..9d941d7 100755
@@ -782,13 +782,14 @@ check_module_dir() {
 # Install a single kernel module along with any firmware it may require.
 # $1 = full path to kernel module to install
 install_kmod_with_fw() {
-    local _modname=${1##*/} _fwdir _found _fw
-    _modname=${_modname%.ko*}
     # no need to go further if the module is already installed
     [[ -e "${initdir}/lib/modules/$kernel/${1##*/lib/modules/$kernel/}" ]] \
         && return 0
     inst_simple "$1" "/lib/modules/$kernel/${1##*/lib/modules/$kernel/}" \
         || return $?
+
+    local _modname=${1##*/} _fwdir _found _fw
+    _modname=${_modname%.ko*}
     for _fw in $(modinfo -k $kernel -F firmware $1 2>/dev/null); do
         _found=''
         for _fwdir in $fw_dir; do