platform/chrome: cros_ec_lpc: initialize the buf variable

Clang static analysis reports this problem
drivers/platform/chrome/cros_ec_lpc.c:379:13: warning: The left operand
  of '!=' is a garbage value [core.UndefinedBinaryOperatorResult]
    if (buf[0] != 'E' || buf[1] != 'C') {
         ~~~~~~ ^

The check depends on the side effect of the read.  When the read fails
or is short, a buf containing garbage could be mistaken as correct.

Signed-off-by: Tom Rix <[email protected]>
Signed-off-by: Tzung-Bi Shih <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: Tom Rix

drivers/platform/chrome/cros_ec_lpc.c

@@ -350,7 +350,7 @@ static int cros_ec_lpc_probe(struct platform_device *pdev)
 	struct acpi_device *adev;
 	acpi_status status;
 	struct cros_ec_device *ec_dev;
-	u8 buf[2];
+	u8 buf[2] = {};
 	int irq, ret;
 
 	/*