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topology: builder: Fix possibly uninitialized variable in write_elem_block()

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When an empty list is passed to write_elem_block(), it may leave
vendor_type uninitialized.
  builder.c: In function ‘write_elem_block’:
  builder.c:127:8: warning: ‘vendor_type’ may be used uninitialized in this function [-Wmaybe-uninitialized]
    ret = write_block_header(tplg, tplg_type, vendor_type,
          ^
  builder.c:114:33: note: ‘vendor_type’ was declared here
    int ret, wsize = 0, count = 0, vendor_type;
                                   ^

Add an immediate return for count = 0 for avoiding it, and simplify
the code initializing vendor_type without using a one-shot loop.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2015-09-08 22:04:48 +02:00
parent 03d6b15291
commit 76b9cae026
1 changed files with 4 additions and 5 deletions
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9
src/topology/builder.c
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@ -116,13 +116,12 @@ static int write_elem_block(snd_tplg_t *tplg,
/* count number of elements */
list_for_each(pos, base)
count++;
if (!count)
return 0;
/* write the header for this block */
list_for_each(pos, base) {
elem = list_entry(pos, struct tplg_elem, list);
vendor_type = elem->vendor_type;
break;
}
elem = list_entry(base->next, struct tplg_elem, list);
vendor_type = elem->vendor_type;
ret = write_block_header(tplg, tplg_type, vendor_type,
SND_SOC_TPLG_ABI_VERSION, 0, size, count);