Fix crash during boot in x86 platform

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readlinkat() may return random value instead of the number of bytes placed in buf and crashing the system in two ways:
1. segmentation fault (buf[-7633350] = ‘\0’)
2. wrong link of watchdogd, resulting dog timeout

Confirmed working in ZenFone 2 x86 series, may fix #2247 and #2356

Signed-off-by: Shaka Huang <shakalaca@gmail.com>

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