use-of-uninitialized-value in MSLEndElement

use-of-uninitialized-value in MSLEndElement: a task in MiMo-V2.6-RL-oss: Agentic RL Environments (MiMo RL release). MemorySanitizer: use-of-uninitialized-value in function MSLEndElement in file graphicsmagick/coders/msl.c