CpuLinux file handle leak.

BUG=crbug.com/110165

Review URL: http://webrtc-codereview.appspot.com/353001

git-svn-id: http://webrtc.googlecode.com/svn/trunk@1429 4adac7df-926f-26a2-2b94-8c16560cd09d

src/system_wrappers/source/cpu_linux.cc

@@ -179,6 +179,7 @@ int CpuLinux::GetNumCores()
     char line[100];
     if (!fgets(line, 100, fp))
     {
+        fclose(fp);
         return -1;
     }
     int numCores = -1;