yadif: remove repeated check on width

The filter already checks that width (and height) are greater than 3.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavfilter/x86/vf_yadif.asm

@@ -220,8 +220,6 @@ cglobal yadif_filter_line, 4, 6, 8, 80, dst, prev, cur, next, w, prefs, \
 cglobal yadif_filter_line, 4, 7, 8, 80, dst, prev, cur, next, w, prefs, \
                                         mrefs, parity, mode
 %endif
-    cmp      DWORD wm, 0
-    jle .ret
 %if ARCH_X86_32
     mov            r4, r5mp
     mov            r5, r6mp

libavfilter/x86/yadif-10.asm

@@ -250,8 +250,6 @@ cglobal yadif_filter_line_10bit, 4, 6, 8, 80, dst, prev, cur, next, w, \
 cglobal yadif_filter_line_10bit, 4, 7, 8, 80, dst, prev, cur, next, w, \
                                               prefs, mrefs, parity, mode
 %endif
-    cmp      DWORD wm, 0
-    jle .ret
 %if ARCH_X86_32
     mov            r4, r5mp
     mov            r5, r6mp

libavfilter/x86/yadif-16.asm

@@ -313,8 +313,6 @@ cglobal yadif_filter_line_16bit, 4, 6, 8, 80, dst, prev, cur, next, w, \
 cglobal yadif_filter_line_16bit, 4, 7, 8, 80, dst, prev, cur, next, w, \
                                               prefs, mrefs, parity, mode
 %endif
-    cmp      DWORD wm, 0
-    jle .ret
 %if ARCH_X86_32
     mov            r4, r5mp
     mov            r5, r6mp