[Coverity CID :215233] Logically dead code in drivers/modem/hl7800.c

[zephyrbot]

Static code scan issues found in file:

https://github.com/zephyrproject-rtos/zephyr/tree/c9a2a5e7fb0194bfb168f5aa1a0a83c73f62acb3/drivers/modem/hl7800.c

Category: Control flow issues
Function: modem_reset_and_configure
Component: Drivers
CID: 215233

Please fix or provide comments in coverity using the link:

https://scan9.coverity.com/reports.htm#v32951/p12996.

Note: This issue was created automatically. Priority was set based on classification
of the file affected and the impact field in coverity. Assignees were set using the CODEOWNERS file.

[github-actions]

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