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charsets: fix read of uninitialized memory in gsm unpacked conversion

Aleksander Morgado requested to merge aleksm/ModemManager:aleksander/fix-uninitialized-in-charsets into main 
    ==1==WARNING: MemorySanitizer: use-of-uninitialized-value
    #0 0x59c6c88a31ef in gsm_ext_char_to_utf8 src/mm-charsets.c:256:13
    #1 0x59c6c88a31ef in charset_gsm_unpacked_to_utf8 src/mm-charsets.c:339:20
    #2 0x59c6c88a31ef in mm_modem_charset_bytearray_to_utf8 src/mm-charsets.c:857:30
    #3 0x59c6c889babd in sms_decode_address src/mm-sms-part-3gpp.c:143:16
    #4 0x59c6c8899d3a in mm_sms_part_3gpp_new_from_binary_pdu src/mm-sms-part-3gpp.c:514:15

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