misc: Fix broken memcmp()

common/lib/mem.asm_x86_64

@@ -41,7 +41,7 @@ global memcmp
 memcmp:
     mov rcx, rdx
     repe cmpsb
-    jecxz .equal
+    je .equal
 
     mov al, byte [rdi-1]
     sub al, byte [rsi-1]

common/lib/mem.s2.asm_ia32

@@ -60,7 +60,7 @@ memcmp:
     mov esi, dword [esp+16]
     mov ecx, dword [esp+20]
     repe cmpsb
-    jecxz .equal
+    je .equal
     mov al, byte [edi-1]
     sub al, byte [esi-1]
     movsx eax, al

decompressor/mem.asm

@@ -60,7 +60,7 @@ memcmp:
     mov esi, dword [esp+16]
     mov ecx, dword [esp+20]
     repe cmpsb
-    jecxz .equal
+    je .equal
     mov al, byte [edi-1]
     sub al, byte [esi-1]
     movsx eax, al