[PATCH] trace-cmd: Fix use of uninitialized variable

[Ian Rogers <irogers@xxxxxxxxxx>]

Caught by clang's -Wsometimes-uninitialized and accepting the suggested
fix:

lib/trace-cmd/trace-input.c:4325:6: error: variable 'sec' is used uninitialized whenever 'if' condition is false [-Werror,-Wsometimes-uninitialized]
        if (handle->file_state >= start_state) {
            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/trace-cmd/trace-input.c:4336:6: note: uninitialized use occurs here
        if (sec)
            ^~~
lib/trace-cmd/trace-input.c:4325:2: note: remove the 'if' if its condition is always true
        if (handle->file_state >= start_state) {
        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
lib/trace-cmd/trace-input.c:4311:26: note: initialize the variable 'sec' to silence this warning
        struct file_section *sec;
                                ^
                                 = NULL
---
 lib/trace-cmd/trace-input.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c
index ecb5682..57bd4ee 100644
--- a/lib/trace-cmd/trace-input.c
+++ b/lib/trace-cmd/trace-input.c
@@ -4308,7 +4308,7 @@ int tracecmd_copy_headers(struct tracecmd_input *handle, int fd,
 			  enum tracecmd_file_states start_state,
 			  enum tracecmd_file_states end_state)
 {
-	struct file_section *sec;
+	struct file_section *sec = NULL;
 	int ret;
 
 	if (!start_state)
-- 
2.35.0.rc2.247.g8bbb082509-goog