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selftests: gpio-mockup-chardev: Check asprintf() for error 

With gcc 7.3.0:

    gpio-mockup-chardev.c: In function ‘get_debugfs’:
    gpio-mockup-chardev.c:62:3: warning: ignoring return value of ‘asprintf’, declared with attribute warn_unused_result [-Wunused-result]
       asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Handle asprintf() failures to fix this.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Shuah Khan <shuah@kernel.org>
This commit is contained in:
Geert Uytterhoeven 2019-01-14 14:51:33 +01:00 committed by Shuah Khan
parent 5bbc73a841
commit 508cacd7da
1 changed files with 6 additions and 3 deletions
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9
tools/testing/selftests/gpio/gpio-mockup-chardev.c
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@ -37,7 +37,7 @@ static int get_debugfs(char **path)
struct libmnt_table *tb;
struct libmnt_iter *itr = NULL;
struct libmnt_fs *fs;
int found = 0;
int found = 0, ret;
cxt = mnt_new_context();
if (!cxt)
@ -58,8 +58,11 @@ static int get_debugfs(char **path)
break;
}
}
if (found)
asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
if (found) {
ret = asprintf(path, "%s/gpio", mnt_fs_get_target(fs));
if (ret < 0)
err(EXIT_FAILURE, "failed to format string");
}
mnt_free_iter(itr);
mnt_free_context(cxt);