extract_utils: Fix system_ext framework blueprint generation.

Change-Id: I20e44be6ea48b9bd5b05055d3cf465f63c908463
diff --git a/build/tools/extract_utils.sh b/build/tools/extract_utils.sh
index 34801fe..6c28ed0 100644
--- a/build/tools/extract_utils.sh
+++ b/build/tools/extract_utils.sh
@@ -826,7 +826,7 @@
         write_blueprint_packages "JAVA_LIBRARIES" "product" "" "P_FRAMEWORK" >> "$ANDROIDBP"
     fi
     local SE_FRAMEWORK=( $(prefix_match "system_ext/framework/") )
-    if [ "${#P_FRAMEWORK[@]}" -gt "0" ]; then
+    if [ "${#SE_FRAMEWORK[@]}" -gt "0" ]; then
         write_blueprint_packages "JAVA_LIBRARIES" "system_ext" "" "SE_FRAMEWORK" >> "$ANDROIDBP"
     fi
     local O_FRAMEWORK=( $(prefix_match "odm/framework/") )