Fix display of HID descriptors

[WaffleLapkin]

The switch from hash tables to arrays + linear lookups in #202 (cc @evelikov) created a bug -- names_genericstrtable uses two variables (h and t) inconsistently in a loop, causing it to always return NULL, except for the first element in the array table.

This in turn causes everything (except "Usage Page") in the HID descriptors to be (null) instead of the right string.

I'm a bit surprised that this hasn't been caught by tests...

For comparison here is a snippet from lsusb -v without this patch:

          Report Descriptor: (length is 103)
            Item(Global): Usage Page, data= [ 0x01 ] 1
                            (null)
            Item(Local ): (null), data= [ 0x06 ] 6
                            (null)
            Item(Main  ): (null), data= [ 0x01 ] 1
                            Application
            Item(Global): (null), data= [ 0x01 ] 1
            Item(Global): Usage Page, data= [ 0x07 ] 7
                            (null)
            Item(Local ): (null), data= [ 0xe0 ] 224
                            (null)

And with this patch

          Report Descriptor: (length is 103)
            Item(Global): Usage Page, data= [ 0x01 ] 1
                            Generic Desktop Controls
            Item(Local ): Usage, data= [ 0x06 ] 6
                            Keyboard
            Item(Main  ): Collection, data= [ 0x01 ] 1
                            Application
            Item(Global): Report ID, data= [ 0x01 ] 1
            Item(Global): Usage Page, data= [ 0x07 ] 7
                            Keyboard
            Item(Local ): Usage Minimum, data= [ 0xe0 ] 224
                            Control Left

[gregkh]

thanks for the fix!