[nft PATCH 1/2] gitignore: Only ignore top level *.m4

This covered files in m4 subdirectory by accident. Assuming it is meant
to catch auto-generated aclocal.m4, reduce its scope to non-subfolders.

Fixes: 5fa8e494ca240 ("build: autotools conversion")
Signed-off-by: Phil Sutter <[email protected]>
---
 .gitignore | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/.gitignore b/.gitignore
index 8673393fac397..3e49330371b8a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,5 +1,5 @@
 # Generated by autoconf/configure/automake
-*.m4
+/*.m4
 .dirstamp
 Makefile
 Makefile.in
-- 
2.54.0