Fix missing return in MipsCpuCaps.

Previously if MipsCpuCaps were called with something other than
dspr2 or msa, the file was closed but still used.

This change assumed the function is only called internally twice:
once for msa and once for dspr2.  If msa is not being detected,
the function assumed dspr2 was being tested and returns dspr2 was
true.

BUG=libyuv:687
TEST=try bots

Change-Id: I80b328eb5ffc7baf5f1ee5a79c16d75c45ff26cc
Reviewed-on: https://chromium-review.googlesource.com/447831Reviewed-by: Frank Barchard <fbarchard@google.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>

README.chromium

 Name: libyuv
 URL: http://code.google.com/p/libyuv/
-Version: 1645
+Version: 1646
 License: BSD
 License File: LICENSE
 

include/libyuv/version.h

@@ -11,6 +11,6 @@
 #ifndef INCLUDE_LIBYUV_VERSION_H_
 #define INCLUDE_LIBYUV_VERSION_H_
 
-#define LIBYUV_VERSION 1645
+#define LIBYUV_VERSION 1646
 
 #endif  // INCLUDE_LIBYUV_VERSION_H_

source/cpu_id.cc

@@ -174,9 +174,7 @@ LIBYUV_API SAFEBUFFERS int MipsCpuCaps(const char* cpuinfo_name,
     if (strcmp(ase, " msa") == 0) {
       return kCpuHasMSA;
     }
-    if (strcmp(ase, " dspr2") == 0) {
-      return kCpuHasDSPR2;
-    }
+    return kCpuHasDSPR2;
   }
   while (fgets(cpuinfo_line, sizeof(cpuinfo_line) - 1, f)) {
     if (memcmp(cpuinfo_line, "ASEs implemented", 16) == 0) {
@@ -186,9 +184,7 @@ LIBYUV_API SAFEBUFFERS int MipsCpuCaps(const char* cpuinfo_name,
         if (strcmp(ase, " msa") == 0) {
           return kCpuHasMSA;
         }
-        if (strcmp(ase, " dspr2") == 0) {
-          return kCpuHasDSPR2;
-        }
+        return kCpuHasDSPR2;
       }
     }
   }