netd: do check on command, not buffer.

Bug: 6132094
Change-Id: I76aef21b07c07db76bbc6587ae732b1ceb4488ce
diff --git a/logwrapper.c b/logwrapper.c
index d9913f2..3601b70 100644
--- a/logwrapper.c
+++ b/logwrapper.c
@@ -200,7 +200,7 @@
      * The command to argp splitting is from code that was
      * reverted in Change: 11b4e9b2
      */
-    if (strnlen(buffer, sizeof(buffer) - 1) == sizeof(buffer) - 1) {
+    if (strnlen(command, sizeof(buffer) - 1) == sizeof(buffer) - 1) {
         LOGE("command line too long while processing: %s", command);
         errno = E2BIG;
         return -1;