executor: prevent non-null expected warnings

The added test triggers warnings like these:

<stdin>: In function ‘syz_mount_image.constprop’:
<stdin>:298:3: error: argument 1 null where non-null expected [-Werror=nonnull]
In file included from <stdin>:26:0:
/usr/include/x86_64-linux-gnu/sys/stat.h:320:12: note: in a call to function ‘mkdir’ declared here
 extern int mkdir (const char *__path, __mode_t __mode)
            ^~~~~
cc1: all warnings being treated as errors

<stdin>: In function ‘syz_open_procfs.constprop’:
<stdin>:530:41: error: ‘%s’ directive argument is null [-Werror=format-truncation=]
<stdin>:85:110: note: in definition of macro ‘NONFAILING’
<stdin>:532:41: error: ‘%s’ directive argument is null [-Werror=format-truncation=]
<stdin>:85:110: note: in definition of macro ‘NONFAILING’
<stdin>:534:41: error: ‘%s’ directive argument is null [-Werror=format-truncation=]
<stdin>:85:110: note: in definition of macro ‘NONFAILING’

Use volatile for all arguments of syz_ functions to prevent
compiler from treating the arguments as constants in reproducers.

Popped up during bisection that used a repro that previously worked.
Update #501

1 files changed, 1 insertions, 1 deletions

diff --git a/executor/common_fuchsia.h b/executor/common_fuchsia.h
index 3dbbaff7c..9749f668b 100644
--- a/executor/common_fuchsia.h
+++ b/executor/common_fuchsia.h
@@ -220,7 +220,7 @@ static long syz_job_default(void)
 #endif
 
 #if SYZ_EXECUTOR || __NR_syz_future_time
-static long syz_future_time(long when)
+static long syz_future_time(volatile long when)
 {
 	zx_time_t delta_ms;
 	switch (when) {