[Nouveau] [PATCH xf86-video-nouveau] xv: fix build warning regarding const qualifier

[Rhys Kidd]

Fixes warning with gcc 8.2:

nouveau_xv.c: In function ‘NVInitVideo’:
nouveau_xv.c:2247:68: warning: passing argument 2 of ‘vlCreateAdaptorXvMC’ discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
    adaptorsXvMC[0] = vlCreateAdaptorXvMC(pScreen, textureAdaptor[0]->name);
                                                   ~~~~~~~~~~~~~~~~~^~~~~~
In file included from nouveau_xv.c:42:
vl_hwmc.h:6:63: note: expected ‘char *’ but argument is of type ‘const char *’
 XF86MCAdaptorPtr vlCreateAdaptorXvMC(ScreenPtr pScreen, char *xv_adaptor_name);
                                                         ~~~~~~^~~~~~~~~~~~~~~

Signed-off-by: Rhys Kidd <rhyskidd at gmail.com>
---
 src/nouveau_xv.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/nouveau_xv.c b/src/nouveau_xv.c
index a7ec21a..3258ef7 100644
--- a/src/nouveau_xv.c
+++ b/src/nouveau_xv.c
@@ -2244,7 +2244,7 @@ NVInitVideo(ScreenPtr pScreen)
 		XF86MCAdaptorPtr *adaptorsXvMC = malloc(sizeof(XF86MCAdaptorPtr));
 		
 		if (adaptorsXvMC) {
-			adaptorsXvMC[0] = vlCreateAdaptorXvMC(pScreen, textureAdaptor[0]->name);
+			adaptorsXvMC[0] = vlCreateAdaptorXvMC(pScreen, (char *)textureAdaptor[0]->name);
 			
 			if (adaptorsXvMC[0]) {
 				vlInitXvMC(pScreen, 1, adaptorsXvMC);
-- 
2.19.1