Fix unitialized variables (#609)

Compiling with gcc 13 and -O3 -flto -Werror=uninitialized found two
possibly unitialized variables.

See also: https://bugs.gentoo.org/916722

Author: ceamac

src/modules/cpuusage/cpuusage.c

@@ -180,6 +180,7 @@ void ffInitCPUUsageOptions(FFCPUUsageOptions* options)
         ffGenerateCPUUsageJsonConfig
     );
     ffOptionInitModuleArg(&options->moduleArgs);
+    options->separate = false;
 }
 
 void ffDestroyCPUUsageOptions(FFCPUUsageOptions* options)

src/modules/wm/wm.c

@@ -148,6 +148,7 @@ void ffInitWMOptions(FFWMOptions* options)
         ffGenerateWMJsonConfig
     );
     ffOptionInitModuleArg(&options->moduleArgs);
+    options->detectPlugin = false;
 }
 
 void ffDestroyWMOptions(FFWMOptions* options)