fix: fix empty string if ustreamer not found (#253)

Signed-off-by: Patrick Gehrsitz <mryel00.github@gmail.com>

libs/core.sh

@@ -82,18 +82,15 @@ function check_dep {
 
 function check_apps {
     local cstreamer ustreamer
-    ustreamer_base="bin/ustreamer"
-    ustreamer="$(find "${BASE_CN_PATH}"/"${ustreamer_base}" \
-                -iname 'ustreamer.bin' 2> /dev/null | sed '1q')"
+    ustreamer="bin/ustreamer/src/ustreamer.bin"
     cstreamer="bin/camera-streamer/camera-streamer"
-
-    if [[ -x "${ustreamer}" ]]; then
-        log_msg "Dependency: '${ustreamer##*/}' found in ${ustreamer_base}/${ustreamer##*/}."
-        UST_BIN="${ustreamer}"
+    if [[ -x "${BASE_CN_PATH}/${ustreamer}" ]]; then
+        log_msg "Dependency: 'ustreamer' found in ${ustreamer}."
+        UST_BIN="${BASE_CN_PATH}/${ustreamer}"
         # shellcheck disable=SC2034
         declare -r UST_BIN
     else
-        log_msg "Dependency: '${ustreamer##*/}' not found. Exiting!"
+        log_msg "Dependency: 'ustreamer' not found. Exiting!"
         exit 1
     fi