logd: fix format-extra-args warning.

Bug: 17409250
Change-Id: Id50ebb57754b12d69ed605d0e2901b8e05c607c6
diff --git a/logd/tests/logd_test.cpp b/logd/tests/logd_test.cpp
index 4bea4be..96877a9 100644
--- a/logd/tests/logd_test.cpp
+++ b/logd/tests/logd_test.cpp
@@ -417,7 +417,11 @@
         if (((p - cp) > 3) && !*p && ((unsigned int)(p - cp) < len)) {
             fprintf(stderr, "\"");
             while (*cp) {
-                fprintf(stderr, (*cp != '\n') ? "%c" : "\\n", *cp);
+                if (*cp != '\n') {
+                    fprintf(stderr, "%c", *cp);
+                } else {
+                    fprintf(stderr, "\\n");
+                }
                 ++cp;
                 --len;
             }