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Fix a string format warning when using security flags:

| ../bash-3.2.48/print_cmd.c:1152:3: error: format not a string literal and no format arguments [-Werror=format-security]
|    cprintf (indentation_string);

Upstream-Status: Backport
Signed-off-by: Ross Burton <ross.burton@intel.com>

diff --git a/print_cmd.c b/print_cmd.c
index d1dfd1a..956db53 100644
--- a/print_cmd.c
+++ b/print_cmd.c
@@ -1149,7 +1149,7 @@ indent (amount)
   for (i = 0; amount > 0; amount--)
     indentation_string[i++] = ' ';
   indentation_string[i] = '\0';
-  cprintf (indentation_string);
+  cprintf ("%s", indentation_string);
 }
 
 static void