[openwrt/openwrt] rules: fix broken commitcount on alpine system

[LEDE Commits]

hauke pushed a commit to openwrt/openwrt.git, branch openwrt-22.03:
https://git.openwrt.org/9aa95bbebb07554ccf6f611ead081f85e1f8b902

commit 9aa95bbebb07554ccf6f611ead081f85e1f8b902
Author: Christian Marangi <ansuelsmth at gmail.com>
AuthorDate: Sat Dec 17 16:39:00 2022 +0100

    rules: fix broken commitcount on alpine system
    
    To generate commitcount we use grep --max-count. This is not present on
    alpine grep and cause wrong generation. Use -m as it's just the short
    version of --max-count and more portable.
    
    Fixes: #11200
    Signed-off-by: Christian Marangi <ansuelsmth at gmail.com>
    (cherry picked from commit eb7ffeafbfa78235b05abb4ae479376150d7a814)
---
 rules.mk | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/rules.mk b/rules.mk
index c893f61b0f..1c6b3abd57 100644
--- a/rules.mk
+++ b/rules.mk
@@ -412,7 +412,7 @@ $(shell \
   if git log -1 >/dev/null 2>/dev/null; then \
     if [ -n "$(1)" ]; then \
       last_bump="$$(git log --pretty=format:'%h %s' . | \
-        grep --max-count=1 -e ': [uU]pdate to ' -e ': [bB]ump to ' | \
+        grep -m 1 -e ': [uU]pdate to ' -e ': [bB]ump to ' | \
         cut -f 1 -d ' ')"; \
     fi; \
     if [ -n "$$last_bump" ]; then \