torture: Remove whitespace from identify_qemu_vcpus output

The identify_qemu_vcpus bash function can return numbers including
whitespace characters, which can be a bit annoying in some bash
dollar-sign substitutions.  This commit therefore strips all spaces and
tabs from the value that identify_qemu_vcpus outputs.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

tools/testing/selftests/rcutorture/bin/functions.sh

@@ -231,7 +231,7 @@ identify_qemu_args () {
 # Returns the number of virtual CPUs available to the aggregate of the
 # guest OSes.
 identify_qemu_vcpus () {
-	lscpu | grep '^CPU(s):' | sed -e 's/CPU(s)://'
+	lscpu | grep '^CPU(s):' | sed -e 's/CPU(s)://' -e 's/[ 	]*//g'
 }
 
 # print_bug