Log errno

Bug 36790737

Test: ensure errno is logged
Change-Id: Ifa9a0b6ee0baebfdfce894622ef40888dd83dddf
diff --git a/biometrics/fingerprint/2.1/default/BiometricsFingerprint.cpp b/biometrics/fingerprint/2.1/default/BiometricsFingerprint.cpp
index 5b00675..4f5aaf9 100644
--- a/biometrics/fingerprint/2.1/default/BiometricsFingerprint.cpp
+++ b/biometrics/fingerprint/2.1/default/BiometricsFingerprint.cpp
@@ -79,7 +79,7 @@
         case -28: return RequestStatus::SYS_ENOSPC;
         case -110: return RequestStatus::SYS_ETIMEDOUT;
         default:
-            ALOGE("An unknown error returned from fingerprint vendor library");
+            ALOGE("An unknown error returned from fingerprint vendor library: %d", error);
             return RequestStatus::SYS_UNKNOWN;
     }
 }