Do proper error handling for a few malloc calls

src/notify.c

@@ -489,16 +489,27 @@ void terminate_notify(void)
 }
 
 #ifdef SOUND_NOTIFY
-int set_sound(Notification sound, const char *value)
+
+/*
+ * Sets notification sound designated by `sound` to file path `value`.
+ *
+ * Return true if the sound is successfully set.
+ */
+bool set_sound(Notification sound, const char *value)
 {
     if (sound == silent) {
-        return 0;
+        return false;
     }
 
     free(Control.sounds[sound]);
 
     size_t len = strlen(value) + 1;
     Control.sounds[sound] = calloc(len, 1);
+
+    if (Control.sounds[sound] == NULL) {
+        return false;
+    }
+
     memcpy(Control.sounds[sound], value, len);
 
     struct stat buf;

src/notify.h

@@ -77,7 +77,7 @@ int box_silent_notify(ToxWindow *self, uint64_t flags, int *id_indicator, const
 int box_silent_notify2(ToxWindow *self, uint64_t flags, int id, const char *format, ...);
 
 #ifdef SOUND_NOTIFY
-int set_sound(Notification sound, const char *value);
+bool set_sound(Notification sound, const char *value);
 #endif /* SOUND_NOTIFY */
 
 #endif /* NOTIFY_H */

src/video_device.c

@@ -209,12 +209,24 @@ VideoDeviceError init_video_devices(void)
             /* Query V4L for capture capabilities */
             if (-1 != ioctl(fd, VIDIOC_QUERYCAP, &cap)) {
                 video_input_name = (char *)malloc(strlen((const char *)cap.card) + strlen(device_address) + 4);
+
+                if (video_input_name == NULL) {
+                    close(fd);
+                    return vde_InternalError;
+                }
+
                 strcpy(video_input_name, (char *)cap.card);
                 strcat(video_input_name, " (");
                 strcat(video_input_name, (char *)device_address);
                 strcat(video_input_name, ")");
             } else {
                 video_input_name = (char *)malloc(strlen(device_address) + 3);
+
+                if (video_input_name == NULL) {
+                    close(fd);
+                    return vde_InternalError;
+                }
+
                 strcpy(video_input_name, "(");
                 strcat(video_input_name, device_address);
                 strcat(video_input_name, ")");