Suppress expected output from commands when support_xxx is false

Signed-off-by: Gilles Peskine <[email protected]>

tests/scripts/components-configuration.sh

@@ -227,7 +227,7 @@ support_build_baremetal () {
     # Older Glibc versions include time.h from other headers such as stdlib.h,
     # which makes the no-time.h-in-baremetal check fail. Ubuntu 16.04 has this
     # problem, Ubuntu 18.04 is ok.
-    ! grep -q -F time.h /usr/include/x86_64-linux-gnu/sys/types.h
+    ! grep -s -q -F time.h /usr/include/x86_64-linux-gnu/sys/types.h
 }
 
 component_build_tfm () {

tests/scripts/components-platform.sh

@@ -98,7 +98,7 @@ support_test_aesni () {
     # in component_test_aesni_m32.
     (gcc -v 2>&1 | grep Target | grep -q x86_64) &&
     [[ "$HOSTTYPE" == "x86_64" && "$OSTYPE" == "linux-gnu" ]] &&
-    (lscpu | grep -qw aes)
+    (lscpu | grep -qw aes) 2>/dev/null
 }
 
 component_test_aesni () { # ~ 60s
@@ -155,7 +155,7 @@ component_test_aesni () { # ~ 60s
 }
 
 support_test_aesni_m32 () {
-    support_test_m32_no_asm && (lscpu | grep -qw aes)
+    support_test_m32_no_asm && (lscpu | grep -qw aes) 2>/dev/null
 }
 
 component_test_aesni_m32 () { # ~ 60s