Revert "exa: Use exaGetPixmapFirstPixel() instead of devPrivate.ptr"

This reverts commit ac460e6836bdd2cd16c9d29743376c16fdc6924e.

Fixes gcc error:
savage_exa.c: In function ‘SavageDownloadFromScreen’:
savage_exa.c:570:26: warning: cast from function call of type ‘CARD32’ {aka ‘unsigned int’} to non-matching type ‘unsigned char *’ [-Wbad-function-cast]
   570 |     unsigned char *src = (unsigned char *) exaGetPixmapFirstPixel(pSrc);
       |                          ^

1 files changed, 1 insertions, 1 deletions

diff --git a/src/savage_exa.c b/src/savage_exa.c
index fd70c0c..33c08c7 100644
--- a/src/savage_exa.c
+++ b/src/savage_exa.c
@@ -567,7 +567,7 @@ SavageUploadToScreen(PixmapPtr pDst, int x, int y, int w, int h, char *src, int
 Bool
 SavageDownloadFromScreen(PixmapPtr pSrc, int x, int y, int w, int h, char *dst, int dst_pitch)
 {
-    unsigned char *src = (unsigned char *) exaGetPixmapFirstPixel(pSrc);
+    unsigned char *src = pSrc->devPrivate.ptr;
     int	src_pitch = exaGetPixmapPitch(pSrc);
     int	bpp = pSrc->drawable.bitsPerPixel;