maint: avoid unportable 'grep -q'

The upcoming gnulib update comes with the new syntax-check named
'sc_unportable_grep_q':

  maint.mk: unportable 'grep -q', use >/dev/null instead
  make: *** [maint.mk:1377: sc_unportable_grep_q] Error 1

Fix offending places.

* cfg.mk (sc_prohibit_test_calls_print_ver_with_irrelevant_argument):
Replace unportable '-q' by redirecting grep output to /dev/null.
* doc/find.texi (node Adding Tests): Likewise.
* init.cfg (find_emits_warnings_): Likewise.

3 files changed, 3 insertions, 3 deletions

diff --git a/cfg.mk b/cfg.mk
index 97086496..75cf1fc3 100644
--- a/cfg.mk
+++ b/cfg.mk
@@ -232,7 +232,7 @@ sc_prohibit_test_calls_print_ver_with_irrelevant_argument:
 	  | { fail=0;							\
 	      while read file name; do					\
 		for i in $$name; do					\
-		  grep -w "$$i" $$file|grep -vw print_ver_|grep -q .	\
+		  grep -w "$$i" $$file|grep -vw print_ver_|grep . >/dev/null \
 		    || { fail=1;					\
 			 echo "*** Test: $$file, offending: $$i." 1>&2; };\
 		done;							\
diff --git a/doc/find.texi b/doc/find.texi
index 379fe646..bf70be6c 100644
--- a/doc/find.texi
+++ b/doc/find.texi
@@ -3050,7 +3050,7 @@ its argument is an unstripped binary file:
 
 @example
 #! /bin/sh
-file "$1" | grep -q "not stripped"
+file "$1" | grep "not stripped" >/dev/null
 @end example
 
 
diff --git a/init.cfg b/init.cfg
index 98423613..42daffb4 100644
--- a/init.cfg
+++ b/init.cfg
@@ -520,7 +520,7 @@ find_emits_warnings_()
 {
   # Find usually emits a warning for the deprecated -d option.
   find -maxdepth 0 -d -quit 2>&1 \
-    | grep -q 'warning:'
+    | grep 'warning:' >/dev/null
 }
 
 # Skip the current test if "." lacks d_type support.