[openwrt/openwrt] Makefile: replace head call with grep's -m

[LEDE Commits]

ansuel pushed a commit to openwrt/openwrt.git, branch master:
https://git.openwrt.org/22b7bd6b1355baf7220136b6bd8277a321b70c39

commit 22b7bd6b1355baf7220136b6bd8277a321b70c39
Author: Rosen Penev <rosenp at gmail.com>
AuthorDate: Sat Aug 20 14:12:32 2022 -0700

    Makefile: replace head call with grep's -m
    
    head is not necessary here.
    
    Signed-off-by: Rosen Penev <rosenp at gmail.com>
---
 Makefile                  | 2 +-
 target/sdk/files/Makefile | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/Makefile b/Makefile
index 3ac110367d..bfb52c5ddd 100644
--- a/Makefile
+++ b/Makefile
@@ -14,7 +14,7 @@ $(if $(findstring $(space),$(TOPDIR)),$(error ERROR: The path to the OpenWrt dir
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' -m 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)
diff --git a/target/sdk/files/Makefile b/target/sdk/files/Makefile
index a710ca5f51..f620f0ef01 100644
--- a/target/sdk/files/Makefile
+++ b/target/sdk/files/Makefile
@@ -14,7 +14,7 @@ export TOPDIR LC_ALL LANG SDK
 
 world:
 
-DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' | head -n 1)
+DISTRO_PKG_CONFIG:=$(shell $(TOPDIR)/scripts/command_all.sh pkg-config | grep -E '\/usr' -m 1)
 export PATH:=$(TOPDIR)/staging_dir/host/bin:$(PATH)
 
 ifneq ($(OPENWRT_BUILD),1)