libusbg: tests: Remove negative buffer test
libusbg: tests: Remove negative buffer test

Size_t is unsigned and passing -1 as buffer length makes no sense.

Signed-off-by: Pawel Szewczyk <p.szewczyk@samsung.com>

Rebased onto current head.

Change-Id: I18e94b152706c4ff1a4ad4e58e53f9940963d194
Signed-off-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>
Reviewed-by: Krzysztof Opasiak <8064eda6f94b3817252b7d7649cf754592f63500@samsung.com>

pszewczyk/libusbg,pszewczyk/libusbg