objtool, spi: amd: Fix out-of-bounds stack access in amd_set_spi_freq()

If speed_hz < AMD_SPI_MIN_HZ, amd_set_spi_freq() iterates over the
entire amd_spi_freq array without breaking out early, causing 'i' to go
beyond the array bounds.

Fix that by stopping the loop when it gets to the last entry, so the low
speed_hz value gets clamped up to AMD_SPI_MIN_HZ.

Fixes the following warning with an UBSAN kernel:

  drivers/spi/spi-amd.o: error: objtool: amd_set_spi_freq() falls through to next function amd_spi_set_opcode()

Fixes: 3fe2612 ("spi: amd: Configure device speed")
Reported-by: kernel test robot <[email protected]>
Signed-off-by: Josh Poimboeuf <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Acked-by: Mark Brown <[email protected]>
Cc: Raju Rangoju <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: https://lore.kernel.org/r/78fef0f2434f35be9095bcc9ffa23dd8cab667b9.1742852847.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/r/[email protected]/

Author: jpoimboe

drivers/spi/spi-amd.c

@@ -302,7 +302,7 @@ static void amd_set_spi_freq(struct amd_spi *amd_spi, u32 speed_hz)
 {
 	unsigned int i, spd7_val, alt_spd;
 
-	for (i = 0; i < ARRAY_SIZE(amd_spi_freq); i++)
+	for (i = 0; i < ARRAY_SIZE(amd_spi_freq)-1; i++)
 		if (speed_hz >= amd_spi_freq[i].speed_hz)
 			break;