soc: qcom: qmi_encdec: Restrict string length in decode

The QMI TLV value for strings in a lot of qmi element info structures
account for null terminated strings with MAX_LEN + 1. If a string is
actually MAX_LEN + 1 length, this will cause an out of bounds access
when the NULL character is appended in decoding.

Fixes: 9b8a11e82615 ("soc: qcom: Introduce QMI encoder/decoder")
Cc: [email protected]
Signed-off-by: Chris Lew <[email protected]>
Signed-off-by: Praveenkumar I <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Bjorn Andersson <[email protected]>

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