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-rw-r--r--src/glsl/apps/purify.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/glsl/apps/purify.c b/src/glsl/apps/purify.c
index 3019e8b220..5ab6bae96d 100644
--- a/src/glsl/apps/purify.c
+++ b/src/glsl/apps/purify.c
@@ -25,6 +25,7 @@
*
**************************************************************************/
+#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -56,6 +57,7 @@ main(int argc,
fseek(in, 0, SEEK_END);
size = ftell(in);
+ assert(size != -1);
fseek(in, 0, SEEK_SET);
out = fopen(argv[2], "wb");