dmabuf_dump: Do not exit if debugfs is not found

dmabuf_dump tool should not exit if debugfs is not found
and must instead continue parsing /proc/<pid>/fd.

Test: adb shell dmabuf_dump
Change-Id: Ie1aa8d4286f89413b5981ea34a9c6b7957a322d7
diff --git a/libdmabufinfo/tools/dmabuf_dump.cpp b/libdmabufinfo/tools/dmabuf_dump.cpp
index fe58178..859075c 100644
--- a/libdmabufinfo/tools/dmabuf_dump.cpp
+++ b/libdmabufinfo/tools/dmabuf_dump.cpp
@@ -180,8 +180,7 @@
     bufs->clear();
 
     if (!ReadDmaBufInfo(bufs)) {
-        fprintf(stderr, "debugfs entry for dmabuf not available, skipping\n");
-        return false;
+        printf("debugfs entry for dmabuf not available, using /proc/<pid>/fdinfo instead\n");
     }
 
     std::unique_ptr<DIR, int (*)(DIR*)> dir(opendir("/proc"), closedir);