bpf: Minor logging improvement

One place where we were logging a register was only logging the variable
part, not also the fixed part.

Signed-off-by: Andrei Matei <andreimatei1@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20231204011248.2040084-1-andreimatei1@gmail.com

kernel/bpf/verifier.c

@@ -6585,8 +6585,8 @@ static int check_stack_access_within_bounds(
 			char tn_buf[48];
 
 			tnum_strn(tn_buf, sizeof(tn_buf), reg->var_off);
-			verbose(env, "invalid variable-offset%s stack R%d var_off=%s size=%d\n",
-				err_extra, regno, tn_buf, access_size);
+			verbose(env, "invalid variable-offset%s stack R%d var_off=%s off=%d size=%d\n",
+				err_extra, regno, tn_buf, off, access_size);
 		}
 	}
 	return err;