trusty: Fix up error messages

Bug: 171750250
Test: m
Change-Id: I41cde13a891da36c85df6a451b2d051c18365797
diff --git a/trusty/fuzz/utils.cpp b/trusty/fuzz/utils.cpp
index f4cf0b6..3526337 100644
--- a/trusty/fuzz/utils.cpp
+++ b/trusty/fuzz/utils.cpp
@@ -113,7 +113,7 @@
     int rc = write(ta_fd_, buf, len);
     alarm(0);
     if (rc < 0) {
-        return Error() << "failed to read TIPC message from TA: ";
+        return Error() << "failed to write TIPC message to TA: ";
     }
 
     return {};