Get rid of unneeded function prologues/epilogues

file.asm

@@ -21,9 +21,6 @@ section .text
 ;----- fopen(const char *filename, const char mode) -----;
 ; return value: pointer to file or value < 0 (neg errno) if file failed to open
 fopen:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	sil, 'r'
 	je	.setMode_r
 	cmp	sil, 'w'
@@ -63,14 +60,10 @@ fopen:
 	syscall
 
 	.quit:
-	leave
 	ret
 ;----- fclose(FILE* fp) -----;
 ; return value: 0 on success, below 0 otherwise (neg errno)
 fclose:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	rdi, 3
 	jl	.ebadf
 
@@ -82,15 +75,11 @@ fclose:
 	mov	rax, -9
 
 	.quit:
-	leave
 	ret
 ;----- fwrite(FILE* fp, char* str) -----;
 ; writes a string to opened file
 ; return value: amount of written characters on success, below 0 otherwise (neg errno)
 fwrite:
-	push	rbp
-	mov	rbp, rsp
-
 	cmp	rdi, 3
 	jl	.ebadf
 
@@ -107,5 +96,4 @@ fwrite:
 	mov	rax, -9
 
 	.quit:
-	leave
 	ret