potential unset variable used in rdpdr

[danieltrentman]

diff -wb rdpdr-old.m rdpdr.m 797a798

      if (prev != NULL)

Need to test prev before assignment in while loop:

RDAsynchronousIORequest *iorq = conn->fileInfo[fd].firstIORequest, *prev;

while (iorq != NULL) { if (iorq == requestToRemove) { if (prev != NULL) prev->next = iorq->next; xfree(requestToRemove); return iorq->next; }