libirecovery: Return "invalid input" instead of unknown error in irecv_getenv()
libirecovery: Return "invalid input" instead of unknown error in irecv_getenv()

aburgh/libirecovery,libimobiledevice-win32/libirecovery,Chronic-Dev/libirecovery,wangwei1237/libirecovery,xerub/libirecovery,libimobiledevice-win32/libirecovery,wangwei1237/libirecovery,libimobiledevice/libirecovery,aburgh/libirecovery,ieswxia/libirecovery,ieswxia/libirecovery,xerub/libirecovery,libimobiledevice/libirecovery,Chronic-Dev/libirecovery