maint: src/*.[ch]: convert more `...' to '...'

Run this (twice):
  git grep -E -l '`.+'\' src/*.[ch] \
    |xargs perl -pi -e 's/`(.+?'\'')/'\''$1/'

1 files changed, 1 insertions, 1 deletions

diff --git a/src/cat.c b/src/cat.c
index 143083e20..bc862d38f 100644
--- a/src/cat.c
+++ b/src/cat.c
@@ -651,7 +651,7 @@ main (int argc, char **argv)
   else
     {
       check_redirection = false;
-#ifdef lint  /* Suppress `used before initialized' warning.  */
+#ifdef lint  /* Suppress 'used before initialized' warning.  */
       out_dev = 0;
       out_ino = 0;
 #endif