ensure fd initialized

New upstream yocto enforces stricter compile rules. Without this commit,
we get this error:

| ../git/oem/ibm/libpldmresponder/utils.cpp:62:9: error: 'fd' may be used uninitialized in this function [-Werror=maybe-uninitialized]
|    62 |     int fd;
|       |
| cc1plus: all warnings being treated as errors

Signed-off-by: Andrew Geissler <geissonator@yahoo.com>
Change-Id: Ie089dfbede0361963a90828ce6826e324285b50d
diff --git a/oem/ibm/libpldmresponder/utils.cpp b/oem/ibm/libpldmresponder/utils.cpp
index b8bbdf0..370e8b5 100644
--- a/oem/ibm/libpldmresponder/utils.cpp
+++ b/oem/ibm/libpldmresponder/utils.cpp
@@ -59,7 +59,7 @@
     FD_ZERO(&rfd);
     FD_SET(sock, &rfd);
     int nfd = sock + 1;
-    int fd;
+    int fd = -1;
 
     int retval = select(nfd, &rfd, NULL, NULL, &tv);
     if (retval < 0)