Fix -Werror=maybe-uninitialized warning in bmp5_get_fifo_data

[heblushabus]

When compiling with GCC on higher optimization levels (like -O2 or -Os) alongside -Werror, the compiler throws a maybe-uninitialized error for fifo_len in bmp5_get_fifo_data().

Initializing fifo_len to 0 resolves this compiler error and ensures safer behavior without affecting the logic, as it is populated by reference via bmp5_get_fifo_len() immediately after.

[Copilot]

Pull request overview

Resolves a GCC -Werror=maybe-uninitialized build failure in the BMP5 driver by explicitly initializing a local FIFO length variable before it is populated via an out-parameter.

Changes:

• Initialize fifo_len to 0 in bmp5_get_fifo_data() to eliminate maybe-uninitialized warnings at higher optimization levels.

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