error.h: test EDOM instead of EINVAL

C99 doesn't require EINVAL, only EDOM, EILSEQ, and ERANGE.

Originally committed as revision 22530 to svn://svn.ffmpeg.org/ffmpeg/trunk

libavutil/error.h

@@ -28,7 +28,7 @@
 #include "avutil.h"
 
 /* error handling */
-#if EINVAL > 0
+#if EDOM > 0
 #define AVERROR(e) (-(e)) /**< Returns a negative error code from a POSIX error code, to return from library functions. */
 #define AVUNERROR(e) (-(e)) /**< Returns a POSIX error code from a library function error return value. */
 #else