unit_evaluate_dbl: fixed err check

arm64 (Apple silicon) needs the comparison with NAN with isnan().

Fixes also failing test misc_test_unit_evaluate on GH macos-14 runner
(arm64 mac),

Author: MartinPulec

src/utils/misc.cpp

@@ -82,7 +82,8 @@ unit_evaluate(const char *str, const char **endptr)
 {
         double ret = unit_evaluate_dbl(str, false, endptr);
 
-        if (ret == NAN || ret >= nexttoward((double) LLONG_MAX, LLONG_MAX)) {
+        if (std::isnan(ret) ||
+            ret >= nexttoward((double) LLONG_MAX, LLONG_MAX)) {
                 return LLONG_MIN;
         }
 
@@ -96,7 +97,7 @@ unit_evaluate(const char *str, const char **endptr)
  * @param    case_sensitive if true 'm' will be considered as milli, otherwise mega
  * @param    endptr         if not NULL, point to suffix after parse
  * @returns                 positive floating point representation of the string
- * @returns                 NAN if error
+ * @returns                 NAN if error (isnan() must be called to check ret val)
  */
 double
 unit_evaluate_dbl(const char *str, bool case_sensitive, const char **endptr)

src/video_compress/cmpto_j2k.cpp

@@ -506,8 +506,8 @@ static void usage() {
 
 #define ASSIGN_CHECK_VAL(var, str, minval) \
         do { \
-                long long val = unit_evaluate_dbl(str, false, nullptr); \
-                if (val < (minval) || val > UINT_MAX) { \
+                const double val = unit_evaluate_dbl(str, false, nullptr); \
+                if (std::isnan(val) || val < (minval) || val > UINT_MAX) { \
                         LOG(LOG_LEVEL_ERROR) \
                             << "[J2K] Wrong value " << (str) \
                             << " for " #var "! Value must be >= " << (minval) \