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vpx_convolve_copy_neon: prefer != 0 to > 0 in tests

this produces better assembly code

Change-Id: I80ed1a165512e941b35a4965faa0c44403357e91

--- a/vpx_dsp/arm/vpx_convolve_copy_neon.c

+++ b/vpx_dsp/arm/vpx_convolve_copy_neon.c

@@ -33,7 +33,7 @@

       src += src_stride;

       dst += dst_stride;

       h -= 2;

-    } while (h > 0);

+    } while (h != 0);

   } else if (w == 8) {  // copy8

     uint8x8_t s0, s1;

     do {

@@ -47,7 +47,7 @@

       vst1_u8(dst, s1);

       dst += dst_stride;

       h -= 2;

-    } while (h > 0);

+    } while (h != 0);

   } else if (w < 32) {  // copy16

     uint8x16_t s0, s1;

     do {

@@ -61,7 +61,7 @@

       vst1q_u8(dst, s1);

       dst += dst_stride;

       h -= 2;

-    } while (h > 0);

+    } while (h != 0);

   } else if (w == 32) {  // copy32

     uint8x16_t s0, s1, s2, s3;

     do {

@@ -79,7 +79,7 @@

       vst1q_u8(dst + 16, s3);

       dst += dst_stride;

       h -= 2;

-    } while (h > 0);

+    } while (h != 0);

   } else {  // copy64

     uint8x16_t s0, s1, s2, s3;

     do {