issue: 4583806 Coverity FORWARD_NULL fixes

Add Coverity suppression comments for repeated FORWARD_NULL false positives.

Coverity reported multiple potential null dereferences in syscall-related
macros. Added `/* coverity[var_deref_op] */` to suppress these false
positives. No functional changes.

Signed-off-by: Omri Ritblat <[email protected]>

Author: OmriRitblat

src/core/sock/sock-redirect.h

@@ -73,7 +73,9 @@
 #define XLIO_SYMBOL(_func)   _func
 #define VALID_SYSCALL(_func) ((orig_os_api._func) != nullptr)
 #define SYSCALL(_func, ...)                                                                        \
-    ((VALID_SYSCALL(_func) ? (void)0 : get_orig_funcs()), orig_os_api._func(__VA_ARGS__))
+    ((VALID_SYSCALL(_func) ? (void)0 : get_orig_funcs()),
+/* coverity[var_deref_op] */
+     orig_os_api._func(__VA_ARGS__))
 #define SYSCALL_ERRNO_UNSUPPORTED(_func, ...)                                                      \
     (VALID_SYSCALL(_func) ? orig_os_api._func(__VA_ARGS__) : ((errno = EOPNOTSUPP), -1))
 #define XLIO_CALL(_func, ...) _func(__VA_ARGS__)