Added partial match in USB product name

In case the usb device name is not found among the available devices, a
partial string comparison is performed.

Author: Stefano Speretta, Innovative Solutions In Space BV
<s.speretta@isispace.nl>
Signed-off-by: Stefano Speretta <s.speretta@isispace.nl>

git-svn-id: https://hamlib.svn.sourceforge.net/svnroot/hamlib/trunk@3054 7ae35d74-ebe9-4afe-98af-79ac388436b8

src/usb_port.c

@@ -145,8 +145,10 @@ static struct usb_dev_handle *find_and_open_device(const hamlib_port_t *port)
               }
               rig_debug(RIG_DEBUG_TRACE, " product >%s<", string);
               if (strcmp(string, port->parm.usb.product) != 0){
-                usb_close(udh);
-                continue;
+				if (strstr(string, port->parm.usb.product) != 0){
+					usb_close(udh);
+					continue;
+				}
               }
           }