[xen staging] xen/tools: fix grep reporting 'illegal byte sequence' in check-endbr.sh

[patchbot@xxxxxxx]

commit 57cf001b8c9970842cb709ddad5c0e4c376a177d
Author:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
AuthorDate: Wed Feb 11 09:04:52 2026 +0100
Commit:     Roger Pau Monne <roger.pau@xxxxxxxxxx>
CommitDate: Thu Feb 12 19:22:38 2026 +0100

    xen/tools: fix grep reporting 'illegal byte sequence' in check-endbr.sh
    
    On macOS the default encoding is UTF-8.  The binary encoding used by the
    grep matching pattern is not valid when processed as UTF-8.  Switch the
    local to C just for the grep invocation to use the binary match pattern
    correctly.
    
    Suggested-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Signed-off-by: Roger Pau Monné <roger.pau@xxxxxxxxxx>
    Reviewed-by: Bertrand Marquis <bertrand.marquis@xxxxxxx>
    Acked-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 xen/tools/check-endbr.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/tools/check-endbr.sh b/xen/tools/check-endbr.sh
index aaaa9ebe6b..9346fe95c7 100755
--- a/xen/tools/check-endbr.sh
+++ b/xen/tools/check-endbr.sh
@@ -107,8 +107,9 @@ if $perl_re
 then
     LC_ALL=C grep -aobP '\xf3\x0f\x1e(\xfa|\xfb)|\x66\x0f\x1f\x01' $TEXT_BIN
 else
-    grep -aob -e "$(printf '\363\17\36\372')" -e "$(printf '\363\17\36\373')" \
-         -e "$(printf '\146\17\37\1')" $TEXT_BIN
+    LC_ALL=C grep -aob -e "$(printf '\363\17\36\372')" \
+                       -e "$(printf '\363\17\36\373')" \
+                       -e "$(printf '\146\17\37\1')" $TEXT_BIN
 fi | $AWK -F':' '{printf "%s%07x\n", "'$vma_hi'", int('$((0x$vma_lo))') + $1}' 
> $ALL
 
 # Wait for $VALID to become complete
--
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