CVE-2022-50304 mtd: core: fix possible resource leak in init_mtd()

In the Linux kernel, the following vulnerability has been resolved: mtd: core: fix possible resource leak in initmtd I got the error report while inject fault in initmtd: sysfs: cannot create duplicate filename '/devices/virtual/bdi/mtd-0' Call Trace: dumpstacklvl+0x67/0x83 sysfswarndup+0x60/0x70...