XvMCScreenKey is defined as XvMCScreenKeyRec's address, so will never be
NULL. Use the check proposed by Alan Coopersmith and Jeremy Huddleston
instead.
Those warnings go away accordingly:
| CC xvmc.lo
| xvmc.c: In function 'ProcXvMCListSubpictureTypes':
| xvmc.c:490:22: warning: the comparison will always evaluate as 'false' for the address of 'XvMCScreenKeyRec' will never be NULL [-Waddress]
| xvmc.c: In function 'XvMCExtensionInit':
| xvmc.c:671:21: warning: the comparison will always evaluate as 'false' for the address of 'XvMCScreenKeyRec' will never be NULL [-Waddress]
| xvmc.c: In function 'XvMCFindXvImage':
| xvmc.c:749:22: warning: the comparison will always evaluate as 'false' for the address of 'XvMCScreenKeyRec' will never be NULL [-Waddress]
Reviewed-by: Alan Coopersmith <alan.coopersmith@oracle.com>
Signed-off-by: Cyril Brulebois <kibi@debian.org>