trace2: make tr2_dst_get_trace_fd() file-scope static

This function never had any external callers in its life, as it gets
accessed always via functions like tr2_dst_trace_write_line() and
tr2_dst_trace_want() that sit at higher level.

Make it file-scope static.

Signed-off-by: Junio C Hamano <[email protected]>

Author: gitster

trace2/tr2_dst.c

@@ -309,7 +309,11 @@ static void tr2_dst_malformed_warning(struct tr2_dst *dst,
 		tr2_sysenv_display_name(dst->sysenv_var), tgt_value);
 }
 
-int tr2_dst_get_trace_fd(struct tr2_dst *dst)
+/*
+ * Return the file descriptor for the DST.
+ * If 0, the dst is closed or disabled.
+ */
+static int tr2_dst_get_trace_fd(struct tr2_dst *dst)
 {
 	const char *tgt_value;
 

trace2/tr2_dst.h

@@ -19,12 +19,6 @@ struct tr2_dst {
  */
 void tr2_dst_trace_disable(struct tr2_dst *dst);
 
-/*
- * Return the file descriptor for the DST.
- * If 0, the dst is closed or disabled.
- */
-int tr2_dst_get_trace_fd(struct tr2_dst *dst);
-
 /*
  * Return true if the DST is opened for writing.
  */