Fixing sign of converted number in ecma_zt_string_to_number.

src/libecmaobjects/ecma-helpers-conversion.c

@@ -186,9 +186,16 @@ ecma_zt_string_to_number (const ecma_char_t *str_p) /**< zero-terminated string
   }
 
   if (begin_p > end_p)
+  {
+    if (sign)
+    {
+      return -num;
+    }
+    else
     {
       return num;
     }
+  }
 
   int32_t e = 0;
 
@@ -197,9 +204,16 @@ ecma_zt_string_to_number (const ecma_char_t *str_p) /**< zero-terminated string
     begin_p++;
 
     if (begin_p > end_p)
+    {
+      if (sign)
+      {
+        return -num;
+      }
+      else
       {
         return num;
       }
+    }
 
     while (begin_p <= end_p)
     {