compile error and NULL ptr deref

[GWO]

Hi,

Great software. Here's a patch that fixes:
i) a compile error on gcc-4.8 [getuid() now needs <unistd.h> including explicitly]
ii) a NULL pointer deref on ./jmtpfs -l with an unknown device

[GWO]

diff --git a/src/ConnectedMtpDevices.cpp b/src/ConnectedMtpDevices.cpp
index b0f569a..c6541e1 100644
--- a/src/ConnectedMtpDevices.cpp
+++ b/src/ConnectedMtpDevices.cpp
@@ -92,9 +92,17 @@ ConnectedDeviceInfo  ConnectedMtpDevices::GetDeviceInfo(int index)
        info.bus_location = m_devs[index].bus_location;
        info.devnum = m_devs[index].devnum;
        info.device_flags = m_devs[index].device_entry.device_flags;
-       info.product = m_devs[index].device_entry.product;
+        if(m_devs[index].device_entry.product != NULL) {
+          info.product = m_devs[index].device_entry.product;
+        } else {
+          info.product = "UNKNOWN";
+        }
        info.product_id = m_devs[index].device_entry.product_id;
-       info.vendor = m_devs[index].device_entry.vendor;
+       if(m_devs[index].device_entry.vendor != NULL)  {
+          info.vendor = m_devs[index].device_entry.vendor;
+        } else {
+          info.product = "UNKNOWN";
+        }
        info.vendor_id = m_devs[index].device_entry.vendor_id;
 
        return info;
diff --git a/src/jmtpfs.cpp b/src/jmtpfs.cpp
index 2d2eed4..ce7390d 100644
--- a/src/jmtpfs.cpp
+++ b/src/jmtpfs.cpp
@@ -32,6 +32,7 @@
 #include <sstream>
 #include <iomanip>
 #include <assert.h>
+#include <unistd.h>
 
 #define JMTPFS_VERSION "0.4"