stb: added exceptional handling.

ftell() could return -1  but fseek() doesn't allow minus values.

Modified to skip irritating coverity report.

Change-Id: I7f66c2d0a3514d324ad23159c20be9fe1bb17724

diff --git a/src/vector/stb/stb_image.h b/src/vector/stb/stb_image.h
index 61d9224..acfdfc0 100644 (file)
--- a/src/vector/stb/stb_image.h
+++ b/src/vector/stb/stb_image.h
@@ -7187,7 +7187,7 @@ STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
    long pos = ftell(f);
    stbi__start_file(&s, f);
    r = stbi__info_main(&s,x,y,comp);
-   fseek(f,pos,SEEK_SET);
+   if (pos >= 0) fseek(f,pos,SEEK_SET);
    return r;
 }