[PATCH xf86-video-i128] Use const char for xf86GetOptValString return type

[Kevin Brace]

Apparently, xf86GetOptValString changed their return type from char
to const char between X Server 1.15 and 1.16. In particular, X Server
commit e1e01d2e33c632e395d7e396f73fba8ae606b15a made the change. This
commit will suppress the compilation warning.

Signed-off-by: Kevin Brace <kevinbrace at gmx.com>
---
 src/i128_driver.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/i128_driver.c b/src/i128_driver.c
index 14bf264..c28d98b 100644
--- a/src/i128_driver.c
+++ b/src/i128_driver.c
@@ -580,7 +580,7 @@ I128PreInit(ScrnInfoPtr pScrn, int flags)
 	xf86DrvMsg(pScrn->scrnIndex, X_CONFIG, "Acceleration disabled\n");
     } else {
         int from = X_DEFAULT;
-        char *s = xf86GetOptValString(pI128->Options, OPTION_ACCELMETHOD);
+        const char *s = xf86GetOptValString(pI128->Options, OPTION_ACCELMETHOD);
         pI128->NoAccel = FALSE;
         if (!xf86NameCmp(s, "EXA")) {
             pI128->exa = TRUE;
-- 
2.7.4