fix another possible passing of unsigned int into a function requiring a signed int, CID 10665

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@40907 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/add-ons/kernel/drivers/network/wimax/usb_beceemwmx/Settings.cpp

@@ -117,9 +117,13 @@ void usb_beceem_trace(bool force, const char* func, const char *fmt, ...)
 	}
 
 	mutex_lock(&gLogLock);
-	int fd = open(gLogFilePath, O_WRONLY | O_APPEND);
+	int filehandle = open(gLogFilePath, O_WRONLY | O_APPEND);
-	write(fd, buffer, strlen(buffer));
+
-	close(fd);
+	if (filehandle >= 0) {
+		write(filehandle, buffer, strlen(buffer));
+		close(filehandle);
+	}
+
 	mutex_unlock(&gLogLock);
 }