CLEANUP: cfgparse: Remove unused label end

This removes the end label from parse_process_number() which
is unused since 5ab51775e736511b7e54f42e080dcef76a284da9, which
first was released in haproxy 1.8.0.

src/cfgparse.c

@@ -662,7 +662,6 @@ int parse_process_number(const char *arg, unsigned long *proc, int *autoinc, cha
 			*proc |= 1UL << (low-1);
 	}
 
-  end:
 	return 0;
 }