build: fix failure detection once more

build/build.sh

@@ -249,7 +249,7 @@ EOF
             |& tee "bin/targets/$target/faillogs/$p.log" >&2
 
         # if build resulted in image files, we can delete the log
-        cnt="$(find "bin/targets/$target" -name '*.bin' -or -name '*.img' -or -name '*.gz' | wc -l)"
+        cnt="$(find "bin/targets/$target/" -name "*$p*.bin" -or -name "*$p*.img" -or -name "*$p*.gz" | wc -l)"
         if [ "$cnt" -gt 0 ]; then
             rm -v "bin/targets/$target/faillogs/$p.log"
         fi