bi-lexer.c (scan_string): Do xmalloc if buffer is null and xrealloc if it's not,…

bi-lexer.c (scan_string): Do xmalloc if buffer is null and xrealloc if it's not, not the other way around.

        * bi-lexer.c (scan_string): Do xmalloc if buffer is null and
        xrealloc if it's not, not the other way around.

From-SVN: r5539

gcc/bi-lexer.c

@@ -92,7 +92,7 @@ scan_string ()
 	  int previous_point_index = point - buffer;
 
 	  buffer_size = (!buffer_size ? 32 : buffer_size * 2);
-	  if (buffer)
+	  if (!buffer)
 	    buffer = xmalloc (buffer_size);
 	  else
 	    buffer = xrealloc (buffer, buffer_size);