4. (10 points) Identify the errors in the code below and explain why they are errors and how they can be fixed. Assume the function "count" is passed an address of a string read in previously in $a0, and a character in the lowest byte of $al. It is called from main, and it returns the number of occurrences of the character in the string. count: lb $s1, 0($a0) loop: beq $sl, $0, exit bne $sl, $al, no add addi $v0, $v0, 1 no_add: addi $a0, $a0, 4 j loop exit: j main