[master] a6c130649 Fix a newly introduced lifetime violation

[Nils Goroll]

commit a6c1306494bab1d95fc7dd571089b80336922a1c
Author: Nils Goroll <nils.goroll at uplex.de>
Date:   Mon Jan 31 18:15:38 2022 +0100

    Fix a newly introduced lifetime violation
    
    TOSTRAND() creates a pointer with temporary lifetime which we must not
    access outside of the expression where it is created.
    
    Incidentally, this is what I had before a polish with good intentions,
    which, as we all know, are not enough.
    
    Noticed by Geoff, thank you
    
    Ref ISO/IEC 9899:2018 §6.2.4 (8)
    Ref 0c96fc6597c3ba6da057bb43acb7f677e6b776f8

diff --git a/vmod/vmod_vtc.c b/vmod/vmod_vtc.c
index 53387c7ee..ee2e5e8f2 100644
--- a/vmod/vmod_vtc.c
+++ b/vmod/vmod_vtc.c
@@ -439,7 +439,6 @@ vsl_line(VRT_CTX, char *str)
 {
 	VCL_INT id;
 	VCL_ENUM side;
-	VCL_STRANDS s;
 	const char *tag, *delim = " \t\r\n";
 	char *save;
 
@@ -469,11 +468,9 @@ vsl_line(VRT_CTX, char *str)
 
 	str = strtok_r(NULL, "\r\n", &save);
 	if (str == NULL)
-		s = vrt_null_strands;
+		vmod_vsl(ctx, id, tag, side, vrt_null_strands);
 	else
-		s = TOSTRAND(str);
-
-	vmod_vsl(ctx, id, tag, side, s);
+		vmod_vsl(ctx, id, tag, side, TOSTRAND(str));
 }
 
 VCL_VOID