[PATCH libdrm] xf86drm: fix compile error for declare i in for loop

[Qiang Yu <Qiang.Yu@xxxxxxx>]

error log:
xf86drm.c: In function 'parse_separate_sysfs_files':
xf86drm.c:3104:5: error: 'for' loop initial declarations are only allowed in C99 mode
     for (unsigned i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
     ^
xf86drm.c:3104:5: note: use option -std=c99 or -std=gnu99 to compile your code
make[4]: *** [libdrm_la-xf86drm.lo] Error 1

Signed-off-by: Qiang Yu <Qiang.Yu@xxxxxxx>
---
 xf86drm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/xf86drm.c b/xf86drm.c
index 728ac78..dc028cc 100644
--- a/xf86drm.c
+++ b/xf86drm.c
@@ -3100,8 +3100,9 @@ static int parse_separate_sysfs_files(int maj, int min,
     unsigned int data[ARRAY_SIZE(attrs)];
     FILE *fp;
     int ret;
+    unsigned i;
 
-    for (unsigned i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
+    for (i = ignore_revision ? 1 : 0; i < ARRAY_SIZE(attrs); i++) {
         snprintf(path, PATH_MAX, "/sys/dev/char/%d:%d/device/%s", maj, min,
                  attrs[i]);
         fp = fopen(path, "r");
-- 
1.9.1

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