Log inotify errors.

Bug: 155954661
Test: boot
Change-Id: Ic054ecf6acebba12485926b66d4fb96fa7712547
diff --git a/cmds/bootanimation/BootAnimation.cpp b/cmds/bootanimation/BootAnimation.cpp
index a1278f3..ecb95bd 100644
--- a/cmds/bootanimation/BootAnimation.cpp
+++ b/cmds/bootanimation/BootAnimation.cpp
@@ -1306,7 +1306,7 @@
     if (mSystemWd < 0) {
         close(mInotifyFd);
         mInotifyFd = -1;
-        SLOGE("Could not add watch for %s", SYSTEM_DATA_DIR_PATH);
+        SLOGE("Could not add watch for %s: %s", SYSTEM_DATA_DIR_PATH, strerror(errno));
         return NO_INIT;
     }