add missing "free(buffer) for allocated buffer

apt-pkg/contrib/fileutl.cc

@@ -251,7 +251,6 @@ int GetLock(string File,bool Errors)
 
       if (errno == ENOLCK)
       {
-
 	 _error->Warning(_("Not using locking for nfs mounted lock file %s"),File.c_str());
 	 return dup(0);       // Need something for the caller to close	 
       }

methods/gpgv.cc

@@ -152,6 +152,7 @@ string GPGVMethod::VerifyGetSigners(const char *file, const char *outfile,
       }
    }
    fclose(pipein);
+   free(buffer);
 
    int status;
    waitpid(pid, &status, 0);