Avoid narrowing errors

C++ with -Wnarrowing complains about these.

src/modules/module_06400.c

@@ -311,7 +311,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
 
   const u8 *iter_pos = token.buf[1];
 
-  char salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
+  u8 salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
 
   salt->salt_sign[0] = hc_strtoul ((const char *) salt_iter, NULL, 10);
 

src/modules/module_06500.c

@@ -462,7 +462,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
 
   const u8 *iter_pos = token.buf[1];
 
-  char salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
+  u8 salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
 
   salt->salt_sign[0] = hc_strtoul ((const char *) salt_iter, NULL, 10);
 

src/modules/module_06700.c

@@ -224,7 +224,7 @@ int module_hash_decode (MAYBE_UNUSED const hashconfig_t *hashconfig, MAYBE_UNUSE
 
   const u8 *iter_pos = token.buf[1];
 
-  char salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
+  u8 salt_iter[3] = { iter_pos[0], iter_pos[1], 0 };
 
   salt->salt_sign[0] = hc_strtoul ((const char *) salt_iter, NULL, 10);
 

src/modules/module_14600.c

@@ -61,7 +61,7 @@ const char *module_st_pass        (MAYBE_UNUSED const hashconfig_t *hashconfig,
 #define LUKS_KEY_ENABLED  0x00AC71F3
 #define LUKS_STRIPES 4000
 // partition header starts with magic
-#define LUKS_MAGIC {'L','U','K','S', 0xba, 0xbe};
+#define LUKS_MAGIC {'L','U','K','S', (char) 0xba, (char) 0xbe};
 #define LUKS_MAGIC_L 6
 /* Actually we need only 37, but we don't want struct autoaligning to kick in */
 #define UUID_STRING_L 40