Merge branch 'jk/squelch-false-warning-from-gcc-o3' into maint

Compilation fix.

* jk/squelch-false-warning-from-gcc-o3:
  color_parse_mem: initialize "struct color" temporary
  error_errno: use constant return similar to error()

color.c

@@ -215,7 +215,7 @@ int color_parse_mem(const char *value, int value_len, char *dst)
 	/* [fg [bg]] [attr]... */
 	while (len > 0) {
 		const char *word = ptr;
-		struct color c;
+		struct color c = { COLOR_UNSPECIFIED };
 		int val, wordlen = 0;
 
 		while (len > 0 && !isspace(word[wordlen])) {

git-compat-util.h

@@ -436,6 +436,7 @@ static inline int const_error(void)
 	return -1;
 }
 #define error(...) (error(__VA_ARGS__), const_error())
+#define error_errno(...) (error_errno(__VA_ARGS__), const_error())
 #endif
 
 extern void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params));

usage.c

@@ -148,6 +148,7 @@ void NORETURN die_errno(const char *fmt, ...)
 	va_end(params);
 }
 
+#undef error_errno
 int error_errno(const char *fmt, ...)
 {
 	char buf[1024];