fix end-of-buffer error in tccpp.c

Quick fix for
http://lists.nongnu.org/archive/html/tinycc-devel/2015-04/msg00160.html.

I don't fully understand the intended semantics of when file->buf_ptr[0]
is valid, but the rest of the code doesn't have any obvious spots with
the same bug.

Feel free to revert this if I'm mistaken or we need to discuss this
change further.

1 files changed, 1 insertions, 1 deletions

diff --git a/tccpp.c b/tccpp.c
index 62bfa9a..b44296d 100644
--- a/tccpp.c
+++ b/tccpp.c
@@ -2888,7 +2888,7 @@ static int macro_subst_tok(TokenString *tok_str,
                     goto redo;
                 }
             } else {
-                ch = file->buf_ptr[0];
+                ch = tcc_peekc_slow(file);
                 while (is_space(ch) || ch == '\n' || ch == '/')
 		  {
 		    if (ch == '/')