lavu/parseutils: rework rational reduction logic in av_parse_ratio()

Avoid to divide num and den by gcd in case of a parsed expression, since
that is already done in av_d2q(), and force reduction in case of "a:b"
form, allowing to honour the max parameter.

The latter change is consistent with the a/b case, and with the
documentation.

libavutil/parseutils.c

@@ -57,12 +57,8 @@ int av_parse_ratio(AVRational *q, const char *str, int max,
         if (ret < 0)
             return ret;
         *q = av_d2q(d, max);
-    }
-
-    gcd = av_gcd(FFABS(q->num), FFABS(q->den));
-    if (gcd) {
-        q->num /= gcd;
-        q->den /= gcd;
+    } else {
+        av_reduce(&q->num, &q->den, q->num, q->den, max);
     }
 
     return 0;

libavutil/version.h

@@ -76,7 +76,7 @@
 
 #define LIBAVUTIL_VERSION_MAJOR 51
 #define LIBAVUTIL_VERSION_MINOR 76
-#define LIBAVUTIL_VERSION_MICRO 100
+#define LIBAVUTIL_VERSION_MICRO 101
 
 #define LIBAVUTIL_VERSION_INT   AV_VERSION_INT(LIBAVUTIL_VERSION_MAJOR, \
                                                LIBAVUTIL_VERSION_MINOR, \