[PATCH] tracing/selftests: Fix false bashism in kprobe_non_uniq_symbol.tc

From: Steven Rostedt <rostedt@goodmis.org>

The checkbashism is giving a false positive to the kprobe test of:

  ($"foo" should be eval_gettext "foo"):
  if [ "$(grep -c -E "[[:alnum:]]+ t ${SYMBOL}$" /proc/kallsyms)" -le '1' ]; then

This is because it sees the $" at the end of the grep as a bash symbol.
Instead, escape the '$' with a backslash as it is within quotes and that
'$' is for grep to process an end of line character and not a bash
variable.

Cc: <redacted>
Fixes: d22c3e0088e85 ("selftests/ftrace: Fix unique symbol check in kprobe_non_uniq_symbol.tc")
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
---
 .../selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc    | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc
index 03eb9e70b438..f8e18ea8c268 100644
--- a/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc
+++ b/tools/testing/selftests/ftrace/test.d/kprobe/kprobe_non_uniq_symbol.tc

@@ -6,7 +6,7 @@
 SYMBOL='init_once'
 
 # We skip this test on kernel where SYMBOL is unique or does not exist.
-if [ "$(grep -c -E "[[:alnum:]]+ t ${SYMBOL}$" /proc/kallsyms)" -le '1' ]; then
+if [ "$(grep -c -E "[[:alnum:]]+ t ${SYMBOL}\$" /proc/kallsyms)" -le '1' ]; then
 	exit_unsupported
 fi
 

-- 
2.53.0