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wctdb24xxp/xhfc.c: Fix uninitialized variable

This fixes a compiler error when building for kernel v6.2:

In function ‘xhfc_getreg’,
    inlined from ‘b400m_probe’ at dahdi-linux/drivers/dahdi/wctdm24xxp/xhfc.c:2563:7:
dahdi-linux/drivers/dahdi/wctdm24xxp/xhfc.c:624:12: error: ‘x’ is used uninitialized [-Werror=uninitialized]
  624 |         if (*lastreg != (unsigned char)addr) {
      |            ^
dahdi-linux/drivers/dahdi/wctdm24xxp/xhfc.c: In function ‘b400m_probe’:
dahdi-linux/drivers/dahdi/wctdm24xxp/xhfc.c:2557:27: note: ‘x’ was declared here
 2557 |         unsigned char id, x;
      |                           ^

Change-Id: I49ca7825ab238333b7d55b0ce5cae5e9e92a2cfb
---
M drivers/dahdi/wctdm24xxp/xhfc.c
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/dahdi/wctdm24xxp/xhfc.c b/drivers/dahdi/wctdm24xxp/xhfc.c
index d37fbd5..3fd2a96 100644
--- a/drivers/dahdi/wctdm24xxp/xhfc.c
+++ b/drivers/dahdi/wctdm24xxp/xhfc.c
@@ -2554,7 +2554,7 @@
 
 static int b400m_probe(struct wctdm *wc, int modpos)
 {
-	unsigned char id, x;
+	unsigned char id, x = 0;
 	struct b400m *b4;
 	unsigned long flags;
 	int chiprev;

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