Simplify raw_buffer's destructor just a tad.
Simplify raw_buffer's destructor just a tad.

UIKit0/thrust,hemmingway/thrust,h1arshad/thrust,rdmenezes/thrust,UIKit0/thrust,hemmingway/thrust,julianromera/thrust,h1arshad/thrust,Vishwa07/thrust,h1arshad/thrust,allendaicool/thrust,lishi0927/thrust,julianromera/thrust,malenie/thrust,allendaicool/thrust,UIKit0/thrust,allendaicool/thrust,google-code-export/thrust,bfurtaw/thrust,Vishwa07/thrust,levendlee/thrust,lishi0927/thrust,levendlee/thrust,hemmingway/thrust,levendlee/thrust,lishi0927/thrust,hemmingway/thrust,rdmenezes/thrust,malenie/thrust,google-code-export/thrust,levendlee/thrust,rdmenezes/thrust,bfurtaw/thrust,google-code-export/thrust,julianromera/thrust,malenie/thrust,h1arshad/thrust,allendaicool/thrust,google-code-export/thrust,lishi0927/thrust,bfurtaw/thrust,julianromera/thrust,Vishwa07/thrust,bfurtaw/thrust,malenie/thrust,rdmenezes/thrust,Vishwa07/thrust,UIKit0/thrust