hw/i386/kvmvapic: Remove dead code in patch_hypercalls()

The patch_hypercalls() function sets up a 'patches'
variable and checks it at the end of the function, but
never modifies it in the middle. Remove this dead code,
which seems to have been present since the function was
added in commit e5ad936b in 2012.

(Spotted by Coverity: CID 1005581.)
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
Acked-by: NJan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: NMichael Tokarev <mjt@tls.msk.ru>

hw/i386/kvmvapic.c

@@ -535,7 +535,6 @@ static int patch_hypercalls(VAPICROMState *s)
     uint8_t alternates[2];
     const uint8_t *pattern;
     const uint8_t *patch;
-    int patches = 0;
     off_t pos;
     uint8_t *rom;
 
@@ -566,11 +565,6 @@ static int patch_hypercalls(VAPICROMState *s)
     }
 
     g_free(rom);
-
-    if (patches != 0 && patches != 2) {
-        return -1;
-    }
-
     return 0;
 }