Remove exception in Randomizer::getBytes()

Same reasoning as in the previous commit applies, except that it won't throw on
a seriously biased user engine, as `range()` is not used.

Author: TimWolla

ext/random/randomizer.c

@@ -155,7 +155,6 @@ PHP_METHOD(Random_Randomizer, getBytes)
 		result = randomizer->algo->generate(randomizer->status);
 		if (EG(exception)) {
 			zend_string_free(retval);
-			zend_throw_exception(spl_ce_RuntimeException, "Random number generation failed", 0);
 			RETURN_THROWS();
 		}
 		for (size_t i = 0; i < randomizer->status->last_generated_size; i++) {

ext/random/tests/03_randomizer/user_throws.phpt

@@ -21,9 +21,4 @@ Stack trace:
 #0 [internal function]: Random\Engine@anonymous->generate()
 #1 %s(%d): Random\Randomizer->getBytes(1)
 #2 {main}
-
-Next RuntimeException: Random number generation failed in %s:%d
-Stack trace:
-#0 %s(%d): Random\Randomizer->getBytes(1)
-#1 {main}
   thrown in %s on line %d

ext/random/tests/03_randomizer/user_unsafe.phpt

@@ -78,11 +78,6 @@ Stack trace:
 #0 %s(%d): Random\Randomizer->getBytes(1)
 #1 {main}
 
-Next RuntimeException: Random number generation failed in %s:%d
-Stack trace:
-#0 %s(%d): Random\Randomizer->getBytes(1)
-#1 {main}
-
 -------
 
 Error: A random engine must return a non-empty string in %s:%d