git: 84a071479253 - stable/13 - fw_stub: fix -Wunused-but-set-variable for firmware files

The branch stable/13 has been updated by bz:

URL: https://cgit.FreeBSD.org/src/commit/?id=84a071479253dd525099e403164313f36aec3d79

commit 84a071479253dd525099e403164313f36aec3d79
Author:     Bjoern A. Zeeb <bz@FreeBSD.org>
AuthorDate: 2021-11-30 14:23:18 +0000
Commit:     Bjoern A. Zeeb <bz@FreeBSD.org>
CommitDate: 2021-12-29 16:02:07 +0000

    fw_stub: fix -Wunused-but-set-variable for firmware files
    
    In case we are only embedding a single firmware image the variable
    "parent" gets set but never used.  Add checks for the number of files
    for it and only print it out if we are exceeding the single file count.
    This fixes -Wunused-but-set-variable warnings for the majority of
    firmware files in the tree.
    
    Sponsored by:   The FreeBSD Foundation
    
    (cherry picked from commit b394e16ef0b5ad0da5e029bcdd3a01e361724d8d)
---
 sys/tools/fw_stub.awk | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/sys/tools/fw_stub.awk b/sys/tools/fw_stub.awk
index 807c51b6190b..94975687f4e2 100644
--- a/sys/tools/fw_stub.awk
+++ b/sys/tools/fw_stub.awk
@@ -151,8 +151,10 @@ for (file_i = 0; file_i < num_files; file_i++) {
 printc("\nstatic int\n"\
 modname "_fw_modevent(module_t mod, int type, void *unused)\
 {\
-	const struct firmware *fp, *parent;\
-	int error;\
+	const struct firmware *fp;");
+if (num_files > 1)
+	printc("\tconst struct firmware *parent;");
+printc("\tint error;\
 	switch (type) {\
 	case MOD_LOAD:\n");
 
@@ -187,7 +189,7 @@ for (file_i = 0; file_i < num_files; file_i++) {
 
 	printc("\t\tif (fp == NULL)");
 	printc("\t\t\tgoto fail_" file_i ";");
-	if (file_i == 0)
+	if (file_i == 0 && num_files > 1)
 		printc("\t\tparent = fp;");
 }