halow: don't print version info that was never read

[ericrwx]

Problem:

When mmwlan_get_version() fails, mmhalow_print_version_info() logs the error and then prints version anyway -- an uninitialized stack struct. The reported morselib/firmware strings are whatever the stack held and the chip ID typically comes out as 0x0000, so the symptom looks like a dead SPI bus or an absent transceiver rather than a failed read. That misdirects the reader into a hardware investigation.

Steps to Reproduce:

1. Make mmwlan_boot() fail, so the transceiver never boots.
2. Call mmhalow_print_version_info() (mmhalow_init() does so unconditionally). Observed: "Error occured whilst retrieving version info - 3" followed by "Morse chip ID: 0x0000" and garbage version strings. Expected: the error alone, with no fabricated values after it.

Fix:

• Return after logging the error, closing the separator line first so the block stays balanced.

Test Plan:

• Verifiy on hardware the spurious 0x0000 chip ID no longer appears; the failure is reported exactly once.