logd: pidToName deficiency

any logging in zygote permanently sets the pidToName

Change-Id: I0b8fdc96fb5965a04d4dc4293c39815beef5eb8e
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index a935c27..ca4b9a6 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -186,6 +186,10 @@
     const char*getName() const { return name; }
 
     inline void add(pid_t p) {
+        if (name && !strncmp(name, "zygote", 6)) {
+            free(name);
+            name = NULL;
+        }
         if (!name) {
             char *n = android::pidToName(p);
             if (n) {