m_option: fix float option values <= 0

FLT_MIN is a small positive number (1.175494e-38), so the check v <
FLT_MIN introduced in 0e7f9c3 made all 0 and negative float option
values error, e.g. panscan=0 or video-align-y=-1.

Fixes 0e7f9c3, fixes mpv-player#15728.

Author: guidocella

options/m_option.c

@@ -1147,8 +1147,8 @@ static int clamp_float(const m_option_t *opt, double *val)
         v = FLT_MAX;
         r = M_OPT_OUT_OF_RANGE;
     }
-    if (isfinite(v) && v < FLT_MIN) {
-        v = FLT_MIN;
+    if (isfinite(v) && v < -FLT_MAX) {
+        v = -FLT_MAX;
         r = M_OPT_OUT_OF_RANGE;
     }
     *val = v;