Merge branch 'fix/argtable3-coverity-findings' into 'master'

fix(console): Add input validation in arg_utils.c functions

Closes IDF-13986 and IDF-13987

See merge request espressif/esp-idf!41736

Author: SoucheSouche

components/console/argtable3/arg_utils.c

@@ -50,13 +50,21 @@ static void panic(const char* fmt, ...);
 static arg_panicfn* s_panic = panic;
 
 void dbg_printf(const char* fmt, ...) {
+    if (fmt == NULL) {
+        return;
+    }
+
     va_list args = {0};
     va_start(args, fmt);
     vfprintf(stderr, fmt, args);
     va_end(args);
 }
 
 static void panic(const char* fmt, ...) {
+    if (fmt == NULL) {
+        return;
+    }
+
     va_list args = {0};
     char* s;