util: Don't use "\e"

'\e' representing ESC (0x1b) is not C standard, it's an GNU extension.
https://gcc.gnu.org/onlinedocs/gcc/Character-Escapes.html#Character-Escapes

Since the code also compiles on Windows with Microsoft compiler, we
should use '\033' instead.

Note: I didn't try to build the whole wpa_supplicant on Windows, so I
don't know if it still builds (I have no Visual Studio 2005 for a quick
test). I just needed the string conversion routines for the P"" syntax
in both directions.

Signed-off-by: Bernhard Walle <bernhard@bwalle.de>

src/utils/common.c

@@ -362,7 +362,7 @@ void printf_encode(char *txt, size_t maxlen, const u8 *data, size_t len)
 			*txt++ = '\\';
 			*txt++ = '\\';
 			break;
-		case '\e':
+		case '\033':
 			*txt++ = '\\';
 			*txt++ = 'e';
 			break;
@@ -427,7 +427,7 @@ size_t printf_decode(u8 *buf, size_t maxlen, const char *str)
 				pos++;
 				break;
 			case 'e':
-				buf[len++] = '\e';
+				buf[len++] = '\033';
 				pos++;
 				break;
 			case 'x':