IOFile: Rename Clear() to ClearError() for clarity.

Source/Core/Common/IOFile.cpp

@@ -94,7 +94,7 @@ bool IOFile::Close()
 void IOFile::SetHandle(std::FILE* file)
 {
   Close();
-  Clear();
+  ClearError();
   m_file = file;
 }
 

Source/Core/Common/IOFile.h

@@ -103,7 +103,7 @@ public:
   bool Flush();
 
   // clear error state
-  void Clear()
+  void ClearError()
   {
     m_good = true;
     std::clearerr(m_file);

Source/Core/Common/LinearDiskCache.h

@@ -100,7 +100,7 @@ public:
 
         m_num_entries++;
       }
-      m_file.Clear();
+      m_file.ClearError();
       m_file.Seek(last_valid_value_start, File::SeekOrigin::Begin);
 
       return m_num_entries;

Source/Core/DiscIO/CISOBlob.cpp

@@ -69,7 +69,7 @@ bool CISOFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
       if (!(m_file.Seek(file_off, File::SeekOrigin::Begin) &&
             m_file.ReadArray(out_ptr, bytes_to_read)))
       {
-        m_file.Clear();
+        m_file.ClearError();
         return false;
       }
     }

Source/Core/DiscIO/CompressedBlob.cpp

@@ -109,7 +109,7 @@ bool CompressedBlobReader::GetBlock(u64 block_num, u8* out_ptr)
   {
     ERROR_LOG_FMT(DISCIO, "The disc image \"{}\" is truncated, some of the data is missing.",
                   m_file_name);
-    m_file.Clear();
+    m_file.ClearError();
     return false;
   }
 

Source/Core/DiscIO/DriveBlob.cpp

@@ -153,7 +153,7 @@ bool DriveReader::ReadMultipleAlignedBlocks(u64 block_num, u64 num_blocks, u8* o
   m_file.Seek(GetSectorSize() * block_num, File::SeekOrigin::Begin);
   if (m_file.ReadBytes(out_ptr, num_blocks * GetSectorSize()))
     return true;
-  m_file.Clear();
+  m_file.ClearError();
   return false;
 #endif
 }

Source/Core/DiscIO/FileBlob.cpp

@@ -36,7 +36,7 @@ bool PlainFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
   }
   else
   {
-    m_file.Clear();
+    m_file.ClearError();
     return false;
   }
 }

Source/Core/DiscIO/TGCBlob.cpp

@@ -121,7 +121,7 @@ bool TGCFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
     return true;
   }
 
-  m_file.Clear();
+  m_file.ClearError();
   return false;
 }
 

Source/Core/DiscIO/WbfsBlob.cpp

@@ -127,7 +127,7 @@ bool WbfsFileReader::Read(u64 offset, u64 nbytes, u8* out_ptr)
 
     if (!data_file.ReadBytes(out_ptr, read_size))
     {
-      data_file.Clear();
+      data_file.ClearError();
       return false;
     }